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Mercedes-Benz SL550 Roadster

Costco price: $105,245

Through partnerships with local authorized dealers, Costco members receive a reduced price on cars that’s meant to be haggle free.

Costco’s websitelists the makes and models in its inventory, from a Toyota Prius to a Porsche Roadster. It then connects members to a local dealer, who offers a pre-negotiated Costco quote.

For a new 2012 Mercedes-Benz SL550 Roadster, with additional accessories such as a black leather interior and a panorama roof with sun shade, as well as added costs such as a gas guzzler tax, we were quoted 5.8 percent off the MSRP price of $111,725. Costco members are also eligible for additional manufacturer rebates and special financing.

Photo: Mercedes-Benz