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Your search for on air returned 2 results.
Twitter and TV/online Video Integration Tips
http://vimeo.com/29058159
DIY On-Air Studio Light
https://www.youtube.com/watch?v=8-QyNVRLLKk Doug teaches you how to build a quick DIY "On Air" studio light using a tap light, some paint, and some tape. It's true the cheapest one I could find online was about $99 but if you check eBay you can find some that are a lot cheaper.