your best bet would be to find a local upholstry shop and have your seats done. when we bought my car it had cloth seats and i wouldnt buy it unless they gave me the black with blue inserts leather seats they took it to a local shop it took them liek 3 days they gave me a rental car and when it was done they called me. they tacked the price on to the price of the car that way we didnt have to pay anything out of pocket.
They run around $450 a piece. You are better off spending the money on racing seats or custom seat covers. The only place I know you can get them is threw the dealership or a totaled car which is unlikely. I saw an entire set (front & back) on Ebay last week go for around $950 + shipping