Unless you really enjoy working on motorcycles, DO NOT purchase a non running airhead. Any airhead that has been sitting for more than a year or two is going to need:
* Tires and tubes ~$200
* Carb rebuild ~$100
* Full tuneup ~$50
* All fluids changed ~$50
* All bearings greased ~$25
* A battery ~$100
Figure on double this if you pay someone like Lap to do the work, and triple this if you go to a dealer.