I've bought some high quality brand name precision tools on Ebay for a fraction of their original price, but there's always a risk of getting something that's damaged or way out of calibration. I just bought a small spirit level, used for setting things up square and level on a machine or assuring that several parts that are being machined are oriented the same way on a holding fixture. It's 4" long, and made of heavy cast iron, Starrett brand, and only cost me about $20.00, shipping and all. Of course, I'll check it for accuracy before I trust it to be used on a real project.
Jerry