They are relatively worthless because no one seems to want them except the guys that spent $50k on them from the Shelby American Auto Club back in the day. There is a black '92 vert on eBay right now that's been there five or six times in the last couple years (just do a search of SAAC). They are the precurser for the '93 cobra ford brought out. They were way overpriced and didn't sell at all. There may have been 60 cars total sold over three years. The '93 version called the super snake even came stripped of everything except the suspension and wheels for $26k.
If you can get it for $7k I'd say do it, but first see whats involved with importing it back home.
I know all this because when I got my '93lx it had all the Saac emblems and it's been a hobby for the last couple years to get all the extra parts to build a vert SAAC replica from a stock GT vert.
Jamie