http://www.sharpshopper.net/They opened one of these near my parent's house and the prices in there are fricking amazing. Everything I've found has been within the expiration date but the prices are way lower than regular stores.
I guess with the rising costs, the main grocery stores are dumping their unused products into outlets instead of food banks (which is sad). But for families on a tight budget you can make a killing in this store with grocery shopping although you never know from one week to the next if you'll find the same products in there.
A good example of what you'll find is products that were labelled for a promotion or holiday that has long passed. I was at the store back in March and my stepfather bought some crackers that had 'Transformers' on the box. Well 'Transformers' came out like 10 months earlier but the crackers still had 5 months left on expiration date.
If you live in Central PA there are several of the Sharp Shopper stores in the area and even one in Virginia. Personally, I think the prices are worth driving an extra 10-20 miles to get there even with today's gas prices.