Just check the list of stars appearing against some large agency's website like TLC's...

Last year's expo in New Jersey had at least a dozen ladies there who were represented by TLC.  Add to that those repped by Lourdes, HelpUBookHer, Pam Peaks, and the other agencies and Independents, there were quite a lot of providers there.    

But checking the list against TLC's is a good first place to start to find out... and then you can call Adonia and set up a date.