Never, ever sell your old consoles. I wonder how much an Atari 2600 goes for now-a-days.
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Anywhere from $100-200 depending on what you have. If you want to make money off consoles. Then you want to have ones that hardly got made like the Virtual Boy. Or console editions that were in very limited numbers. Like the Panzer Dragoon Orta Special Edition Xbox which only 999 of them got made. You are really not going to make out on a popular mass produced console. It's those less known/made and limited edition ones you will make out on.