You are looking to sell? On tire rack they go for 160-170 each and the warranty. You are up against that and the fact that these particular tires don't have the best reputation.
If you are selling privately, I'm not so sure the warranty transfers...if not, and you REALLY need to get rid of them, then $400 for the set would be my starting point and be prepared to negotiate from there..
Or you could start at $500 and be prepared to hold them for a little while.