Are we talking $15,000 U.S. ? If so, yes that would be a good price... $45,000 for this car would be a good price. $35,000 would be an awsome price.
So, yes $15,000 is good. Too good I might say. I would be suspicious of the car at that price.
Make sure you get a Pre Purchase Investigation (PPI) done before you start negotiating for it.