If you're an American Express Cardmember you'll get the chance to buy a 2005 BMW Z4 3.0i roadster for $5,000 via the credit card company's new web promotion called My Wish List. Other items for sale for cheap include a Creative Zen Portable Media Center for $200 (retail $499), plasma TVs and Vespa scooters. But it's the $40,000+ Z4 that seems the most extreme bargain. But don't worry there's a catch. Only nine are available for sale. So get ready for Monday when the Z4 hits the web.