Dennison, TX? If you don't mind a day trip, here's a web site with possible cars in Texarkana / Shreveport / Bossier (Shreveport is approx. 225 miles - about what I would drive to Dallas from here!) .. http://www.uautopullitautoparts.com
Set the inventory filters to the various brands and models car, and search for the appropriate years and colors. Also, check their price list.
Last I asked, "seat" is a bench or a pair of buckets ... so at $30/seat, it's $60 for the front and back. Get those recovered and you're STILL about what the used ones cost in Dennison!
Besides, they're not that hard to get out - what, two bolts at the back, rock them forward, unplug the power, and lift them out?