I just bought a job site air compressor from a storage facility; they sell the stuff people leave behind. Menard's had a 3-pack of Nail Guns for $60 on clearance. I love the trim nailer and the crown stapler. It also came with a micro-pinner that I have not found a use for yet. I guess I don't do enough detail work.
Here is a web site with some great cheap tools:
http://www.dpciwholesale.com/
They are wholesalers, so there is a $100 minimum order, but their prices are about a third to half of retail. Some of the stuff ends up being junk, but so far I have only had that happen with items that only cost a dollar or two. I bought both sets of deep-well impact sockets they sell, and they were very high quality.
They also sell knives and a lot of other stuff. I buy my Christmas presents from them.