on the ones the coupon was over i usually buy one extra if i dont know the store...like target, then i buy one more...brings up the total but worth it since they dont put a number of how many coupons i can use like my grocery store, they limit on 4 of the same coupons, so lets say you have seventeen for crest maxfresh for 1.00 but they are .99 then i would buy 18 and the .17 cents overage should go to the extra one you bought...i dont know if that makes any sense but it seems to work out ok for me...not so worth it if you dont have alot of the coupons though....the ones i save for that would be my grocery store and as they are doing the coupons i would say that was only .99 and they adjust it...depends on the store/cashier...i think most stores can adjust the coupons or prices however they do it but it depends on if that cashier has done it before...good luck...also a tip is to find the nicest looking cashier and just ask when you get to the line if its ok...you know it should be ok in your head but i think it puts them not on the defensive and makes them want to help you...and if they say no right away def go to another cashier or customer service
i hope it works out good for you!!!