I also bought mine through Physique and am very happy with it. Note that their 6 quart tank might prove too small for you - by all means buy a 12 quart tank! Their 60 piece stone kit is superb value! Ellisons are doing a 20% discount on theirs, making it more affordable.
Have a look on ebay, there are some good deals, I bought the naturally formed ones from buyer bodyworkzone and it came with the heater and I am impressed with them. Also came with 7 chakra stones which was a nice addition :)