This is awesome! I was literally thinking about a Game Boy Micro just as I scrolled down the page and there it was. These Game Boys are running $50 and up to around $300 depending on which one you have. This should bring you a great amount of credits. Good Luck!
its has some minor scratches from use but nothing major. as far as testing it to verify that it still works (i do a lot of electronic repair and tinkering) i used the connector from the old battery on an iphone battery to check it.