His name is Rob Ocelot (found him on newsgroups, where he claimed to have protos a lot). Then found him on EFnet. He goes there by Sutekh or Suth.

He owns:

* Total Carnage prototype
* Worms (NTSC) prototype
* Nightmare Circus prototype (+ english manual proofs)
* Might and Magic III prototype
* Pengo prototype
* Wind Commander prototype (Microprose)

Sega CD:
* Citizen X prototype ("but it\s kinda moot since GDG released it.... but I think this version is more comp0lete than the release"). That means two builds of one game. Yummy.
* Lunar: Silver Star Story master burn copy
now probably the most interesting:
* Sonic CD 920

He's not willing to sell those though. He said trade is better, which sucks. I'm pushing him about the SCD920 though. He's still deciding on it. I think I'm gonna get some bullshit MCD samples to trade for some of his stuff.

He got all of them (apart from Wind Commander) from Clint Dyer, the guy who did manuals and screenshots for Sonic 3 and Sonic & Knuckles, and was involved in some stuff in 32x developement. What's really interesting, that Clint Dyer is the source of all Sonic Crackers protos (there's a shitload of copies of that, we should get one, I saw one on a newsgroup for $60, another for $80, 10 years ago though :P). 

There's a good chance that this Sonic CD proto is the only one in existance. He said it's the exact one that's in the picture on Sonic CulT (no link, too lazy). Still waiting for the price :P

Also, this Clint Dyer guy had the only Neptune there was. And he confirmed it was just a wooden case with genesis+32x inside it. Still worth getting... The sad thing is, I was searching for Dyer and he seems to have disappeared from internet 5 years ago. Wieeeerd.