You might try a machine shop. Buying from them would be pretty expensive, but they can probably direct you to a good chop-shop/salvage yard.

Also, once you master riding it, you can clean up at any carnivals that come through town. They limit prizes to something like one-win-a-day. However, the biggest loot up there is usually an electric scooter. If you carry out an electric scooter every day for a week or so, your e-bay income could grow substantially