I recently found something similar, yet on one side powerful (bigger CPU, more RAM), on the other less accessible (only HDMI and USB interfeace). It's called CStick -> http://www.cstick.com/ yet it's cost is about 100$. If someone is interested...
Actually it's $200.
People can diss the raspberry pi as outdated, underpowered or whatever, but it's good enough, and $30 is revolutionary - the key is it's pocket money.