Came across this on Deal Extreme Today , Obviously a clone of the Nintendo Retro Game Machines but also has 500 games onboard, heres more details:

NES Retro Mini TV Handheld Family Recreation Video Game Console Built-in 500 Classic Games - Two Buttons Version
Do you feel bored in your free time? Do you want to find something wonderful and meaningful to do? If so, this video game console would be your good choice. There are 500 different built-in classic games in it. Playing it, you would gain the fun of your childhood and the fun with your family, which is very suitable for amusement and recreation in family.
Features:
Support video output to TV with AC cable.
Suitable for amusement and recreation in family.
There are 500 built-in classic games, which cannot be changed.
Classic and reminiscent games would remind you the childhood and bring the joy and fun at that time to you.
There are A and B buttons on the machine, which improves the playability for it requires player's higher APM and operations.

More Here