I think this may have been posted before but at a higher price. I recently bought the 12 month XBOX live + Camera bundle - so this wasn't much use to me; but it's excellent if you just need the camera at a bargain £14.99 delivered!
Next cheapest is Argos at £19.99
The only minor catch is that not everything is in retail boxes, but they are brand new.
Taken from website: Experience video chat, video messaging and more. Xbox Live Vision is a next-generation camera that brings interactive social gaming to life. The camera allows you to personalize your gaming experience with your own unique Gamertag picture, send photo messages, and chat by video with friends and family in real time over Xbox Live.
Using the Xbox Live Vision camera, you can also chat by video with your friends while playing popular downloadable games such as Bankshot Billiards 2, Texas Hold'em, Hardwood Hearts, Hardwood Spades and more, available for paid download from Xbox Live Arcade.
Maximize your Xbox Live Gold Membership with video chat and photo messaging * Put a face on your Gamertag and make yourself known * Personalize your online gaming experience with face-in-game technology * Bring motion-based games to life using your body movements to control the action * Snap crystal-clear images with VGA 640Hx480V video at 30 frames per second and still photos at 1.3 megapixels
Includes: Live Vision Camera, Xbox 360 Headset, plus Robotron Game (downloads). Items are brand new but are not in any retail packaging