Its always good to shop around guy, I worked at an Auto Parts Plus store for 6 odd years and most of the time everyone paid retail and dinks paid more (we actually had a "preferred customer" account set up that charged 10% above retail) But most of the time if you were a chic and hot you got a deal. But if you drove a honda and a ricer you paid more. At Auto Parts Plus stores they have the actually cost, jobber and retail all in plain sight and can easily charge you whatever they want. It is common practice to bump up the retail price on an invoice to show you got a deal, when in fact you didn't, so Always shop around.