I love or Big Lots. I always find something and find a lot of fun gifts there as well. Their giftwrap section is really fun and their frames are inexpensive too. They have nice matted 8X10 and 11X14 that are only $4.
I was surprised to see Hallmark, Martha Stewart, Crayola, Huggies, Pampers, and tons of other name brand products for less. Some of it is junk, like a PP said, so be warned.
Ours has Martha Stewart papercraft right now. They have tissue paper flowers for $2 that I bought for adding to the top of gifts instead of ribbons or bows. And they have paperbag puppets (5 you build yourself, self-adhesive) that my son LOVES! I even bought a few extra to have around once those wear out.
Their food buyout is really interesting. You can find things you've probably never heard of right along side your favorite soup or cereal. They carry Campbells cream of mushroom soup in a bigger sized can for $1.25. It's like a can and a half but not as much as a family size. It's perfect for casseroles. Their canned goods are usually fine, but check the dates just like you would anywhere else. I got a huge can of Green Giant greenbeans (it's 12 cups) for the holidays. I make 2 GBCs for Christmas so it was a deal for $2.00! EXP: 2011.
But trust me, stay away from the "less than perfect" Kraft macaroni and cheese. I thought how imperfect can a noodle be? But they were cracked, so once cooked they broke out into a million pieces. It just didn't taste right.
They just started a frequent buyers program called Buzzclub you can join for free. Once you make 10 purchases of $20 or more (not hard to do!) you get 20% off your next purchase. You can also sign up for email flyers that let you know the sales before they are released.