$5.00 - grabbed a 1U “3Com SuperStack II Hub 10,” dunno if it's a router, hub or what, but it's got RackMacHack written ALL over it!
Terrific. Just so's you know, I once managed to squeeze a B&W G3 motherboard and heatsink, a 1U ATX (B&W compatible) power supply, and a 3.5" ATA hard disk, into a 1U rack. And it was a shallow rack too, not one of those 40-60cm deep rack server cases. One of them would have left room for a front mounted CD/DVD drive and second HD, amongst other things. Even with the shallow one, I was eyeing off the geometric possibilities for a slot-loading laptop CD drive

Only the lack of a low-profile PCI right angle adapter to mount the video card prevented me from moving ahead to powering that sucker up. Good luck!