I got a server rack on Craigslist for $50 which I thought was a bargain. It has more than enough room for my equipment, but what u/jautor said is true: the thing is huge and heavy. The screws weren't that expensive, but I've put a small fortune into outfitting it with shelves, blanks, drawers, and custom faceplates for my gear. I think the result looks pretty good, but not fantastic. Pics in my thread.
Oh, and one more thing: beware of stripped screwholes. The combination of shelf, gear and faceplate puts a lot of pressure on the four screws holding it in place. If a couple of those strip, you may have to reconfigure the whole rack or use Locktite or something.