Black and White Reversal can be purchased from Freestyle
http://www.freestylephoto.biz/sc_search.php?rfnc=407 and I am going to a fairly local lab, The Cine Lab, to have my film processed.
http://www.cinelab.com/ They may allow you to mail film to them. Dwayne's only processes E-6 Reversal. They don't processes Vision Negative or any reversal black and white.