Don't they just feed into Truecar anyway? Maybe that was AMEX which was touting their car buying service to me. I'm in favor of making the process easy and if Costco does that, sounds good to me, but any service that just blasts out your information to multiple dealers without actively working on your behalf is no different than going to the manufacturers site, building the car you want and asking for quotes. It's not like Costco has any special leverage. Dealers don't think, "shit, we'd like to ask more for this car, but this guy has a Costco membership, so let's eat the loss. We'll get em next time." It's just another lead for them to follow.