RadioShack.com has a Microsoft Messenger Kit for Xbox 360 for $19.99 with Free Shipping.
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- Chatting with friends and family on Xbox Live and Windows-based PCs is easy using the Xbox 360 Messenger Kit. This device easily connects to any Xbox 360 controller and provides easy to use chat capabilities while maintaining gameplay functionality in one easy-to-hold device. The Messenger Kit includes a Chatpad and Xbox 360 Headset.