I just thought of this...find a junked car with undamaged wheels and just take off the wheels. Would this work? Or do they usually take the wheels off?

 

Yes. Most junk yards have computer inventories and can tell you over the phone if they have the wheels and/or tires or and other parts your looking for. They don't always have all four though and you may have to get them from more then one place to make a set.