Learn the Sales Cycles
Everything, and I mean everything goes on sale at some point in time or another. Knowing when the prices are lowest and buying to stockpile is important. These are called sales cycles and it takes a while to learn them and fine tune your shopping habits around those low price times.
For example knowing that during the summer BBQ and picnic supplies will be on sale this is when you grab your coupons and stock up on barbecue sauce, mustard (not 63 bottles please), mayonnaise, hot dogs, hamburger meat, paper plates and the like.