honestly the classifieds here as well as 300zxclub is the best bet for good Z's, you'll find your random good ones on ebay here and there but craigslist usually find none that are really worthwhile and autotrader usually is a total loss...i always found buying from a forum member usually means they took care of the car better than the 18yr old who's looking to post on craigslist to sell their car to pay for something else...