I'm trying to track down a 2003 Mercedes Benz E320 wagon with green exterior and tan interior. No, I don't deserve it, but I've been waiting for a W210 wagon for 10 years, so it's time.

Problem is, they're tough to find. I've got eBay Motors e-mailing me whenever it finds one. I also run nationwide searches on Autotrader weekly (I really wish they had an e-mail alert service).

Are there any other popular used car websites which attract established sellers such as dealerships and allow for detailed searches? My (temporary) impulsive impatience thanks you.