be a member of Costco and browse what u wana buy, costco will submit the specifications u desire to the dealersips close to ur area and will send email offers to the car spec u give, its up to u, the Costco member/car buyer to choose which u think offers the best price for what comes in the package, dealerships will compete for u and not the other way around, also note u PAY THE INVOICE PRICE AND NOT THE MSRP PRICE, u can save as much as $3000 and up depending on what vehicle u choose
http://www.costcoauto.com/Default.aspx