Super88,
As you stated that you are looking for a car already built, the following:
If you are looking for a new car I would recommend the BDR. It is right at your price point.
Backdraft Racing
If you are looking for used cars, just look at what is offered in the car for sale section located on this forum.
You might also check with House of Cobras
HOC for used cars. They are quite close to you.