I'm looking at a White with Red Interior S2000 at a dealership. It's a 2002 with 36k miles, and it's Certified. I didn't see anything wrong with it. What would be fair price for something like this, given that it's winter?

 

www.kbb.com or www.edmunds.com would have estimates for you. I find kbb's prices to be a low-ball while edmunds tends to be a bit high, but YMMV