pouët.net

so, next week I'm going to get a tiny usb keyboard. It has to be tiny but usable. Does anyone have any recommendations ? Should be around Height: 203.2 mm (8.00 in) Width: 134.8 mm (5.31 in)

I can only recommend you to stick it to a Raspberry Pi so everything stay tiny! :)

I've seen a few of those in the local hardware store, I doubt there's much difference between the build quality.

get one of those apple ones if build quality is important. i myself have a Samsung one (bluetooth tho) which feels flimsy but does its job when typing on a tablet, so i guess what gargaj says, there are many of em, go to Mediamarkt and try some out, pick the one that seems most OK.

get one with a touchpad built-in and fgs, don't buy a non-qwerty one, they're a nightmare on the pi...

I can recommend a Rii mini K12.. (bought one for my Raspi)
And an Akai MPK mini. (bought one for demoparties)

I bought one of these Kano Keyboard and I think it's alright. Haven't used it a whole lot, though. Big benefit? It's orange. Works with Bluetooth and USB, iirc. Charges via USB.