My aunt got a jag off of ebay.....thousands below blue book...it's been awesome for her.
when I was car shopping I bought that carchex thingie and it was awesome. there was a lot of info there that I otherwise wouldn't have known.
I love my car (even if I didn't buy it off ebay) but it sure helped to bring in those price quotes too...helped me get my car about 3000 under blue book value!!!