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Sorry, but do not have a specific URL. I have some friends in the business and discovered it that way. It would be best if you could find a movie supply house in your area and check some out. As you know, our choice of "what works best" is very much a "Ford vs Chevy" topic :>)

I did a quick Google and found this for starters:

http://www.bhphotovideo.com/c/shop/5805/Lightstands_Wheeled.html

http://www.bhphotovideo.com/c/product/611489-REG/Avenger_A3058CS_A3059CS_High_Overhead_Stand.html#specifications

Hope that helps