I've seen the small G2 Stunticons but never Motormaster: http://cgi.ebay.com/Transformers-G2...oryZ4696QQssPageNameZWDVWQQrdZ1QQcmdZViewItem The seller has other prototypes as well, http://search.ebay.com/_W0QQsassZmarrine_vs_hydralisk
I think I seen one on e-bay once before back in 2002 but it was for all of the G-2 stunticons, (Motormaster included) I don't remember the final bid but it was over $5000 at that time.
if it is him...i wish him all the luck..even though i want this BADLY!!!!!!!!!!!! i got no money (the usual) so i hope someone who wanted one badly like me gets it