It is always a good idea to take a copy of the Wal-Mart Coupon Policy with you EVERY TIME YOU GO! That way, you shouldn’t have any problems.
With Walmart’s coupon policy if your coupon is more than the value of the item, they will allow an overage…which means you can make money using coupons! I have been told not all stores will allow this.
Walmart allows you to price match ads from most stores. You are not required to have the ad, but it is a good idea to have them in case there is a question.