I kept my stock rear excedra when I got my new tires.  It seems to be in great shape with no cracking and there's about a quarter inch of tread on it.  It came off of a '98 with 3600 Kms on it.

http://www.members.shaw.ca/briboles/tire1.jpg

http://www.members.shaw.ca/briboles/tire2.jpg

Sorry for the blurry pics.

possible yoink!

Perfect for practicing burnouts!

How much.

Not really looking for anything for it but maybe a trade for something?

Tires deteriorate with age.  A six year old tire if it was not used on a regular basis can be a problem.  The "rubber" needs to be  flexed on a regular basis.  I've seen car tires fail early because the car sat around for a few years without being used.