Looking for a decent 4u case..

I have a 42u rack that is in a closet, I need to put 3 systems in it. Each system is regular ATX and has a standard PSU, that is why I am looking for 4u cases.

I found a few cases on the Egg, but at 60-70 bucks apiece plus the 70 or so bucks in shipping I will prolly end up just getting some rack shelves. But I would much rather get them in rack cases.

Anyone know of some inexpensive routes I could go in? I have been keeping an eye out on eBay. But a site where I could buy 3 of the same models will help my OCD.:D