Yesterday, I went to World Market because I received a free $10 gift certificate for my birthday. I walked out paying exactly $0. How did I do it? I purchased 4 items that were on sale for 2 for $5.
The challenge with a lot of coupons is most items are priced at $X.99 so you have to buy a filler item to get over the minimum amount. Watch for sales like the one I found to maximize the gift cert. I love when it is 100% off.