If you can sign up for USAA, I think they have an even better buying program then Costco. I am shopping for an Element or maybe a V6 M/T 6speed Hyundai Genesis Cope. Different cars I know, but my mind is all over the place. I did look at Costco/USAA pricing though and except for the Element, USAA was consistently under Costco by a good margin in the area I will be moving to. Especially if you buy "Detroit".....or Mercedes. However, in the area I currently live at, USAA doesn't even have any dealer affliation, but Costco does.
Truecar for where I currently live for the next 6 months
Truecar for where I am going (Northern California area, rest is also for Nor Cal only)
Costco
USAA
Problem I have is Costco had a pop-up page saying the Element is a high demand vehicle, so their pricing may not be good (in my current area at least). Also, Costco shows an invoice lower then what Truecar says. From reading about people buying through USAA and seeing how they give me different pricing from different dealers, seems like the price they give is a done deal and you just need to add TTL. Not sure about Costco because of the "high demand" list given to Elements here. Possibly on the mainland it'd also be a no hassle buy.