I bought mine off of Ebay for $100.
Here is a pair on Craigslist, Denver:
http://denver.craigslist.org/pts/822965996.html
These are actually very good seats, having been designed by Lear Corporation. The set I have will eventually go into my '89 asc/McLaren convertible (it's a 2-seat convertible based on a Mustang coupe).
Shiny Side Up!
Bill