That site will require that you are a Bank of America customer, though the link is unfortunately broken. If you are an AMEX, USAA, PenFed, or Consumer Reports customer instead, check out their respective car buying sites. They are variations on the same program.

Alternatively, https://www.truecar.com/ can be used by anyone, is mostly using the same data and dealer network, but the prices might be slightly higher.

(Disclaimer: I'm a TrueCar employee.)