Convenience stores are designed to make quick purchases easy, but that convenience often comes with a higher price. When you need one or two things on the way home, paying a little extra may not seem like a big deal. The problem starts when convenience-store shopping becomes part of your regular grocery routine. Everyday products can cost noticeably more than they do at supermarkets, discount grocers, or warehouse clubs. If you are trying to lower your grocery bill, these are some of the items worth removing from your convenience-store shopping list.