Take a look at this deal on Amazon for a 100-count pack of GoEcoVita Biodegradable Kids' Flossers. These are priced at $9.99, but you'll get a cheaper price when you clip the Amazon coupon for 20% off.
Then be sure to check out with Subscribe & Save for an extra 10% or 15% off. You could pay as little as $6.49. By subscribing you'll get a minimum discount on your first Subscribe & Save order, and when you have five or more subscriptions shipped to the same address, you'll unlock the maximum discount.
Learn more about how Amazon Subscribe & Save works and shop for more Subscribe & Save deals. Here's how to find more Amazon coupons.