http://www.sweathelp.org/PDF/BotoxDeliv ... oresis.pdf
The iontophoresis machine that they tested in the two patients seems to be very different and is described as a drug delivery system (Iomed Phoresor II -- Retail around $700 -- http://www.isokineticsinc.com/category/phoresor). It seems like a very limited quanitity of Botox is required using this combination treatment -- in comparison to the 100 or so injections that are typically required when Botox is applied in and of itself.
If you know a friendly dermatologist, this method is worth looking at, maybe even using other iontophoresis devices.