Honestly, to answer OP's question, probably around $35 dollars. Before you jump on me, I know what it's market value is, but that's what I'd personally pay for it. I was even a big fan of the NES shadowgate (I know it started out on the Mac but the NES is the definitive version for me) but with the change in the game's presentation, and the rep with other Icom Simulations games from the era, I don't think it's deserving of it's price tag (actually rarity aside). So maybe I'll never get to play it, and that's ok (even my retro backlog is enormous at this point) but I would definitely pick it up if I got a deal.