I'm not certain of this, but can't you offer a "cash" discount if the buyer pays with check or money order? I know at a lot of computer shows I've been at vendors often sell their items for a certain price, but offer a discount if you pay with cash/check (so they can avoid credit card fees).
Does anyone know the item number of the bluetooth module used in the SONY CR Series of laptops. Until the other day, only the european models offered internal bluetooth while the american models didn't. My hope is that I can get that module and install it as I did with a Gateway laptop this summer.