A true gem has popped up on ebay; the highly uncommon Mega Man 3 Tiger Handheld game. Although it remains package-less, the system is in tip top condition, complete with working buttons and battery pack door.
For a simple LCD game, MM3 remains pretty faithful to the NES classic, featuring an array a familiar foes and challenges. It's not the greatest of ports, but its still very satisfying nonetheless -- and it makes a great collector's item. Read up more info on the game here.
The game will run you $99.99 plus and additional $5.99 shipping. If you feel that's a bit overpriced, the seller is willing to negotiate via the "Make Offer" option.