I just picked up a Kymco Super 9 for $100, its not running but these small engines shouldn't be too hard to bring back to life. And if not, I could always part it out.  Its a 2 stroke with 5,000km on it. The plastic is in rough shape, but everything else looks functional.

 

It was in a couple of pieces when I picked it up.

 It also looks like its been in a run in or two, the steering needs adjusting to be aligned.

I'm thinking worst case scenario I can use sheet metal to craft a custom body and probably flip it, so I can get a real bike or a bigger scooter.