mush,
thought i'd chip in with some pricing info. at the last auction i attended several complete yet non working mini's were sold for under $100. two of which were pac mini's(both working quiz games), one went for $30(i should be punched for missing this one), and the other for $60, 2 turbo mini's $50 each, and an omega race went for $70ish. there were a few others as well, but they went for over $100(including a battlezone and space invaders). and then a few others that were working but i didn't even bother paying attention to(pac, si, and 1942 in pac cab). this auction had more mini's than most but there is usually a few at least.
if that vendor either drags his feet, or tries to charge too much, there are other options.