Open Bitcoin ATM | Bitcoin ATM Explorer
The Open Bitcoin ATM claims is “the worlds first open-source automated teller machine for education and experimentation.” (I suppose they beat Skyhook to the punch?)
The website includes a step by step tutorial to build one, and states that the cost of components is less than $500. It appears to do BTC for cash, but doesn’t dispense cash for BTC.
We also have this sweet demo: