i never seem to have any luck in the wild. i've only got one noteworthy find that comes to mind, but its for a bunch of games. i found out that a friend of mine was the son of a famous video game journalist, of course i asked about prototypes because i was really into collecting them at the time. after a couple of months he dug out some boxes of games and told me that he had 2 nes protos. i finally talked him into selling them to me after many months. i go over to his house to pick up the protos and he tells me "they're somewhere in that box" and it's a huge box of production nes games but i wasn't at all interested in them because i was so excited about the protos. i start digging through it and about 10 minutes later i've got 16 nes prototypes in a pile next to me. i can't remember the last time i was this excited as i kept pulling them out of the box. then he goes and gets some more boxes of snes, genesis, and gameboy games. i dug through those boxes and found a few protos for each of those systems. i left with every proto that i found there. it costed me a lot, but i got to meet this video game journalist and i thought that was almost as cool as the find itself.