Make a list, and check it twice

Before you go shopping, write a list – and stick to it once you get there. If you don't have a strong idea of what you need you'll run into the problem of buying things you already have, or buying things you don't need. Don’t put anything in the cart that’s not on the list, no matter how tempting. This concept may not only help your bottom line, but also perhaps help your other bottom line!