Maybe it's because I spent countless days glued to these things when I was a kid, but I must get Takara Tomy's new solar-powered, officially licensed Nintendo Game & Watch keychains. And their price is as tiny as their size.
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Oh man I've spent countless hours playing on these in their "handheld" form factor. Honestly at that time I was more excited about them than I am today about say a psp.
If they put them up in the states I am buying at least 3 :)