Microsoft Xbox 360 Standard Wireless Controller (Black) Microsoft NSF-00001 for $26.99
Refurbished
This Xbox 360 standard wireless controller makes the perfect addition to any home, office or dorm Xbox 360 game system. Prolong your gaming excitement with the adjustable vibration feedback for longer battery life. This controller utilizes 2.4 GHz wireless technology to deliver an impressive 30-foot range. Connect your headset to the built-in port and enjoy hours of Xbox Live play with your friends!
They also have the wired version for $22.99. The wired version does also work on Windows.
just to note, it's refurbished
@llabra: That's a great deal! Wired controllers are a lot more useful than people think.
Shipping price is kind of obscene 8 bucks for 8-10 day shipping. No thanks!
Best Buy is selling Wii, PS3, and XBox 360 controllers for $35 or $25 on Black Friday, I forget.
@blinkdmb: Hmm. I bought a wired and wireless and shipping was only $6 for what looks like ground mail.
@bhermit: Thanks for the tip. I hope they have it for online purchases also.
With shipping around $6, that puts this refurbished unit @ about $34. You can get new for about $39, if the extra $5 bucks is worth it to you:

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