I think G-Man is selling his '44 P-car. I don't think the 912 is available as anything else but a coupe. It's relatively simple to work on being nothing but a VW engine. Heck, you can buy a longblock for USD$400! If you're not opposed to changing the oil every thousand miles and doing valve adjustments every 3k miles then this is the car for you
There are also some Porsche 911's out there for around USD 6-10k. These, depending on how much you intend to put into them ($ and labor) might be worth looking into.
Kuan