An NES prototype of the popular game Blaster Master has been placed up for sale on eBay. The game is being sold by Ross Miller, who has previously sold other NES prototypes. Ross Miller has a feedback score of 378 with a 100% positive feedback score.
Ross had the prototype certified by VGA and noted it has 2 differences between it and the final production game. These being the World Select at the beginning and the World 1 to World 2 glitch.
The current asking price is $1,199.