How to Extreme Coupon at Walmart - LiveAbout If you present a $2 coupon for a $1 item, most stores will give you the item for free. But, if you present that $2 coupon at Walmart, they'll give you the item for free and allow you to keep the difference (the coupon overage). You can have them apply the extra $1 to other items in your cart, or you can take the difference in cash.