This deal has ended.
Buy.com now has the Xbox 360 Wireless Controller with a Play and Charge Kit on sale for just $41.25, the lowest price to-date and far off the $60 to $65 that all other reputable stores are charging. This includes a standard Xbox wireless remote (these get about 40 hours of use) with a "play and charge" cable that you can connect to the controller for non-stop use. Shipping is free and there's no tax (except CA, MA, MD, NY, TN). Of note: buy 3 and use this $5 off $100 coupon if you are opening a new Buy.com account.