The Mignon Game Kit
lets you build your own portable game boy system, with a stunning 7 x 5
pixel resolution. (No, that's not a typo, but those individual red
lights look gorgeous!) The kits come with different amounts of
components, price EUR 29 – 69 plus shipping (no distribution outside
Europe as near as I can tell).

Here's where it gets cool: you can hard-wire simple games. And since
this device makes sound in the video, it could be used live for
chiptune music. (via Pixelsumo)