Looking for 360 wireless receiver for PC

[rawr90]

Since I once again have a PC that can handle gaming, I wanted to use my 360 controller as a gamepad, but apparently Microsoft stopped selling the wireless receiver by itself, and only bundles it with a controller now.
Does anyone know a good place to pick one up for a decent price? I want to avoid buying a new wired controller if possible.
Thanks!

 

[phantasyx]

I don't use mine and don't plan on using it, if you would like it I can sell it for 20 shipped out, please PM if interested. I also have a extra xbox 360 wireless controller for sale in needed