Adafruit have just announced a new case for the Raspberry Pi. Retailing for under $10, it features a black base into which you snap your Pi and a clear top half (which features a slot for a flat GPIO cable).
I did notice, however, that it’s not compatible with their microSD card adapter… which is just a huge oversight in my opinion as it requires only a couple of millimetres to accommodate it. Only a minor fail, though, and it’s certainly a nicely sculpted case. Read more and decide if you want to buy here