Newegg has the Microsoft Xbox 360 Black Wireless Controller for Windows: http://www.newegg.com/Product/Product.aspx?Item=N82E16823109243
for $43.99 - $7 coupon code EMCNJHN34 = $36.99 with free shipping.
This includes the USB receiver that lets you use your 360 wireless
controllers with your PC. The controller itself is just a standard 360
controller that will work with your XBOX. Not a bad price considering Amazon
sells the controller for $36 and the receiver for $21.
