Every store has a clearance section. Some, like Target, have many. Target has one in the toy section, the grocery section, heck! Pretty much every section! The ends of many aisles at Target hold treasures and goodies that I love to look through. Sometimes you can find amazing deals.
My favorite grocery store (Reasor's) has a shopping cart that they put items in at random times that are marked down. Most of the cans are dented, but never expired. Well, I haven't seen expired items. I'm sure someone somewhere has.
It is not always a good deal though! One time they had a can of corn marked at $.45 which is not a bad price. Except for the fact that the regular cans were on sale for $.40 making them cheaper. That is when it's helpful to be conscientious of prices. If it's a good price and you have room in your budget then by all means stock up!
Tonight I made Tortilla Soup from my friend's blog Crumbs and Chaos (you'll love it, check it out) using some items I'd purchased over time from Reasor's shopping cart. One ingredient was enchilada sauce which I paid $.25 for. If I'd bought it regular price, I'd have spent over $1.
Take some extra time to explore the stores. Don't be afraid of asking sales clerks if they have a clearance section. Also, don't forget you can use coupons for these items as well!