Cellfire.com allows you to download coupons and redeem them at checkout either by entering your cell phone number or swiping your grocery card. King Soopers Sour Cream 16 oz is on sale, starting tomorrow, for 10/$10. Cellfire.com has a coupon for 75 cents off of one 16 oz King Soopers Sour Cream. Your final price is 25 cents. Cellfire.com is a great website to download coupons for various Kroger items plus a lot of brand name items as well.