Too many modded stuff today, so I'll begin with something official.

Bounder Amstrad CPC sample tape and Bombjack Spectrum review copy

Finally some vintage confidential items!

Japan-Games has some Famicom Box carts, some strange Pippin DEV items and a cool Famicom love hotel unit

John Carmack Autographed Orcs & Elves Nintendo DS Lite

Last one reached 3,549 USD. But that was 100% for charity.

Wii-PC mod

Ok, but it's a Wii stuck inside a PC case.

Premium Xbox 360 With LCD TFT Monitor Built In

 
This is not an handheld.

Other stuff:
Telespiel Pong Allied`s Name of the Game 2
RACERMATE/COMPUTRAINER full set
DK cereals cel

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