Starting 5/25/11-5/30, True Value Hardware stores will have their paint, Buy One, Get One! This includes one gallons as well as 5 Gallon containers. The ad says limit 5 gallons, although due to the stores being locally owned, many stores are not limiting the amount you can buy. Also, some stores are taking pre-orders, so you do not have to wait in line. I would recommend calling your local store for more details.
Thanks to Mara for this thrifty tip