Laundry detergent stockpile running low? Be sure to grab this stock-up opportunity this week at CVS. Buy four Persil detergents and use four $1.00 coupons. When you spend $20.00 on select products, you’ll get back $5.00 Extrabucks. At CVS, spend thresholds are pretty generous, allowing you to reach at least 98% of the required amount in order to trigger the Extrabucks.