At AX this year I saw a copy of Another Century's Episode Portable at a seller's booth for $30, and I battled within myself for a good long time over whether or not to buy it. By the time I made my decision, someone else bought it.
Also a friend of mine actually found a NEW copy of Zone of the Enders 2 at a Gamestop a few years ago, nice enough to get it for me as a gift.