Just grabbed this Gameboy for $10.00 plus $4.14 shipping. The Gameboy is in decent condition, just needs a good cleaning.
Issue: Vertical lines are present within the lcd.
Fix: Run the tip of a hot soldering iron across the bottom of the screen. Contact points have become lose, causing these verticle lines to appear.
Currently Nintendo Gameboy’s sell for around $30. I think I can get more after I clean it up.