This isn't technically a Mac but I didn't know where else to put it.
After reading this thread http://www.applefritter.com/node/22749#comment-54671 I am now hooked on ANS's! I want a case to make some kind of TeleTubbies Noo-Noo robot from! Or maybe install the guts of two or three Dual Quad Xeon MacPros in!
Anyway there is one on eBay but I bet his reserve is stratospheric: