T-shirts in white are $50. That's your car.
A bit less for generics.
Not sure about postage, but it shouldn't be much.
I would need a few pics of your car (they can be emailed to
hotrod_matt@hotmail.com). They should show front three quarter views and particularly and modifications so that the drawing can match your car.
Generally there are no backgrounds with the t-shirts. Text is to your your specification.
I will post an example in the next day or two. Print can be on front or back. If on the back a small version of just the car will be repeated on the front left hand side.