If you can get it for 600 being an 85 and its something you really want, go for it. That is a fair price for that grade.
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Some of my favorite games: Dune Battle for Arrakis. Golden Axes. Herzog Zwei. Doom/Quake. Starcraft 64, Conker's Bad Fur Day. TMNT 2 Arcade game. Turtles in TIme. Command and Conquer. Super Mario 2 and 3. Battletoads though its hard as he.l. I give up typing to many more to include.