Nehemie Prophete | Updated

The September Costco Coupon Book Is Here — See Our 20+ Favorite Deals

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If you’re a Costco member, check your mailbox (or the membership desk at your local store) for the next edition of the Costco Coupon Book, which will be valid Aug. 25 - Sept. 21, 2025 .

While we'll include every page of the September Costco coupon book below once we get our hands on it, you won’t need a physical copy of the book to claim these discounts at Costco. And there aren’t any Costco coupons that you’ll need to cut out to get the sale prices. The savings are automatic for anyone with a Costco membership, whether you’re shopping Costco online or in the store.

But I should warn you that Costco’s online prices are nearly always higher than in-store prices (especially for pricey things like furniture), and Costco doesn’t offer price matching for online vs. in-store. That’s why I always recommend shopping in-store to get the best Costco deals. I’ve got a few other Costco price hacks if you’re curious.

If you’re not couponing yet, you’re missing FREE deals. Download the KCL app now .

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Best September Costco Coupon Book Deals

Our team of expert shoppers picked the best deals from the September Costco ad, plus gathered in-store prices so you can see just how much you'll save with each deal.

Groceries

MadeGood Granola Minis 24-Pack
In-Store Deal at Costco
MadeGood Granola Minis 24-Pack
$7.99$11.9933% off
What to buy
1 MadeGood Granola Minis, 24 ct, $11.99
Buy 1, save $4, limit 5
Exp 09/21/25

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Activia Lowfat Yogurt 24-Pack
In-Store Deal at Costco
$6.39$10.8941% off
Exp 09/21/25

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Pirate's Booty Cheddar Puffs
In-Store Deal at Costco
$9.89$13.3926% off
What to buy
Exp 09/21/25

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Jimmy Dean Croissant Sandwiches
In-Store Deal at Costco
$10.19$14.4930% off
Exp 09/21/25

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Mars Chocolate Candy Bars 30-Pack
In-Store Deal at Costco
$22.49$29.9925% off
What to buy
Exp 09/21/25

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Monster Energy Drink 24-Pack
In-Store Deal at Costco
$30.99$38.9921% off
What to buy
Exp 09/21/25

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Keurig Crafted Classics K-Cup Pods
In-Store Deal at Costco
$29.99$39.9925% off
What to buy
Exp 09/21/25

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Personal Care Items

Pantene Hair Care
In-Store Deal at Costco
$9.99$12.9923% off
What to buy
Exp 09/21/25

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Head & Shoulders Shampoo
In-Store Deal at Costco
$10.49$14.9930% off
What to buy
Exp 09/21/25

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Gillette Deodorant 5-Pack
In-Store Deal at Costco
$12.99$16.9924% off
Price Summary
$2.60 per deodorant
Exp 09/21/25

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Olay Body Wash 3-Pack
In-Store Deal at Costco
$11.49$15.9928% off
What to buy
Buy 1, save $4.50, limit 3
Price Summary
$3.83 per body wash
Exp 09/21/25

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Crest Complete Toothpaste 5-Pack
In-Store Deal at Costco
$10.99$14.9927% off
Price Summary
$2.20 per tube
Exp 09/21/25

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Gillette Venus Razors 13-Pack
In-Store Deal at Costco
$21.99$29.9927% off
Price Summary
$1.69 per razor
Exp 09/21/25

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Gillette Razor Refills 16-Pack
In-Store Deal at Costco
$39.99$49.9920% off
What to buy
Price Summary
$2.50 per cartridge
Exp 09/21/25

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Household Items and Paper Goods

Kleenex Ultra Soft 12-Pack
In-Store Deal at Costco
$16.39$21.3923% off
Price Summary
$1.37 per box / $0.02 per tissue
Exp 09/21/25

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Charmin Ultra Strong Toilet Paper
In-Store Deal at Costco
$24.19$30.6921% off
Price Summary
$0.03 per sq ft
Exp 09/21/25

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Swiffer Sweep + Mop Kit
In-Store Deal at Costco
$19.99$24.9920% off
What to buy
Exp 09/21/25

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Detergent and Toilet Paper

Gain + Oxi Detergent
In-Store Deal at Costco
$15.99$19.9920% off
Price Summary
$0.10 per load
Exp 09/21/25

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Tide Detergent
In-Store Deal at Costco
$19.99$24.9920% off
Price Summary
$0.13 per load
Exp 09/21/25

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Baby Deals

PediaSure Plus Kids' Shake 24-Pack
In-Store Deal at Costco
$29.99$39.9925% off
What to buy
Exp 09/21/25

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Similac Formula
In-Store Deal at Costco
$44.99$54.9918% off
What to buy
Buy 1, save $10, limit 8
Exp 09/21/25

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Best August Costco Coupon Book Deals (Valid July 30 - Aug. 24)

These deal prices end Sunday, Aug. 24, 2025.

Groceries

Frito-Lay Classic Mix 54-Pack
In-Store Deal at Costco
$14.99$19.9925% off
What to buy
Exp 08/24/25

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Premier Protein Shake 18-Pack
In-Store Deal at Costco
$25.99$31.9919% off
What to buy
Exp 08/24/25

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Kirkland Signature Organic K-Cups
In-Store Deal at Costco
$33.99$39.9915% off
Exp 08/24/25

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Personal Care Items

Aveeno Daily Moisture Lotion 2-Pack
In-Store Deal at Costco
$13.49$17.9925% off
What to buy
Price Summary
$6.75 per lotion
Exp 08/24/25

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Gillette Venus Razor 15-Pack
In-Store or Online Deal at Costco
$19.99$24.9920% off
What to buy
Shipping: Free
Price Summary
$1.33 per razor
Exp 08/24/25

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Household Items and Paper Goods

Ziploc Bags Variety Pack
In-Store Deal at Costco
$11.49$14.3920% off
What to buy
Price Summary
$0.04 per bag
Exp 08/24/25

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Duracell AA Batteries
In-Store Deal at Costco
$17.99$19.9910% off
What to buy
Exp 08/24/25

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Detergent and Toilet Paper

Tide + Downy Jumbo Detergent
In-Store Deal at Costco
$15.99$19.9920% off
Price Summary
$0.16 per load
Exp 08/24/25

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Diapers and Wipes

Kirkland Baby Wipes
In-Store Deal at Costco
$15.99$19.9920% off
Price Summary
$0.02 per wipe
Exp 08/24/25

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Huggies Plus Diapers
Online or In-Store Deal at Costco
$39.99$49.9920% off
What to buy
Shipping: Free
Price Summary
$0.38 per diaper
Exp 08/24/25

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September Costco Coupon Book (Valid Aug. 25 - Sept. 21, 2025)

Below, you can flip through the full ad scan of this month’s Costco coupon book. Use the right and left arrows to scroll through the pages, or select a page to enlarge it.

Costco Monthly Ad Scan

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The Costco Coupon Book is a printed flyer that lists current sale prices available online and in-store.

Costco calls this printed booklet the "Member-Only Savings (In-Warehouse and Online)," but most shoppers simply refer to it as the monthly Costco Coupon Book.

A new Costco Coupon Book comes out in the mail just about every month. The deals inside the printed booklet are usually valid for 26 days, but the exact dates will be listed on the front cover. Deals periods typically start on a Wednesday and end on a Sunday.

The next Costco Coupon Book deals will start on Monday, Aug. 25, 2025.

Next Costco Coupon Book start date on August 25, 2025

According to leaked copies posted online as early as Aug. 17, we confirmed the next Costco Coupon Book is valid Monday, Aug. 25 - Sunday, Sept. 21, 2025. This aligns with our original prediction.

As for the next Costco Coupon Book after this one, we predict it'll be valid Sept. 24 - Oct. 19, 2025.

KCL TIP: Costco usually mails out a new Costco Coupon Book about a week before the sale actually begins.

Tips for Using the Costco Coupon Book

1. Remember that sale cycles rotate, so you'll see different brands and products on sale each month.

While many product categories go on sale every single month at Costco (like vitamins, laundry detergent, and oral care), the specific brands and products will rotate.

So if you don’t see the brand of toothpaste you want on sale this month, just wait a month or two, and you'll likely see it pop up in a future coupon book.

2. Look for the '+Costco.com' icon to know if the sale price is available online.

Some of the low prices advertised in the Costco coupon book will be available in store only. That’s because Costco’s online prices aren’t always as low as their in-store prices, since they have to factor in shipping and handling.

But many of the items in the coupon book will have a red icon that says “+Costco.com” next to the price. This means that the product is available at the same price online. If it’s missing that icon, you can assume the online price will be higher than advertised.

KCL TIP: Because of potential price differences, I always recommend shopping in person at your local warehouse to get the absolute lowest prices at Costco.

3. Request a price adjustment if you see a price drop on something you bought within the last 30 days.

Did you recently buy something at Costco, only to see it go on sale the very next week? As long as you’re not in the business of reselling items, you’re totally allowed to ask for a Costco price adjustment for most purchases made within the last 30 days.

To request a price adjustment for something you bought in the warehouse, just visit the Returns desk at the Costco location where you made the purchase. For online purchases, complete the price adjustment request form online.

Note: Costco will never match their in-store prices to online prices and vice versa. Costco's online prices are usually a little higher to cover shipping and handling costs.

4. Didn't get a mailed copy? Check your mailing address in the Costco app.

As long as you're a current Costco member, you should receive a Costco Coupon Book in the mail each month. Costco will send it to the mailing address on file for the primary member on the account.

If you didn’t receive a book, make sure your mailing address is listed correctly in your Costco.com account online or in the Costco app.

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