I'd be shocked if you also got the federal tax credit. For one thing, it could lead to fun games: Imagine if every purchaser of the car gets the $7500 tax credit.
I buy it from the factory, I get $7500 (but pay about $100K).
I sell it to you for $7500. You get $7500 back. It's free to you.
You sell it to me for $7500. I get $7500 back. I keep my car, and you just made $7500.
Repeat as necessary.