Himalayan Salt Stones are one of two options I use for Hot Stone massage. I also use the traditional Basalt Stones and work them into the majority of my sessions upon request. I have found that the Himalayan Stones have been the favorite of clients as the heat really penetrates. There is also the added benefit of all the trace elements and minerals that do get deposited into the skin.
There is no additional charge for the stones as I feel that some heat applied during the session does make the muscles much more receptive to the work being done. I also use a heating pad when areas such as the back and the legs seem particularly tight so as to shorten the warm up time of the muscles so that more time can be used getting the desired result.