The seats go for about 200-300 a piece if they are mint and complete from track up. The aftermarket headrest covers sell brand new for about 100 on eBay. An average pair of front buckets both manual tracks go for about 200-250 a pair. (most people will tell you more, but I was looking for a set back in 10/08 and this is what my research turned up.) If you have a power driver track that works and is complete, add about 150-175.
JMHO