I think this is a pretty good price, it's for sale at Costo.com:

http://www.costco.com/Browse/Product.aspx?Prodid=11123647&cm_mmc=BCEmail_202
-_-Focus-_-52-_-ZodiHotTapTravelShower_BCEmail_202

The Zodi site lists it at $149.
http://www.zodi.com/web-content/Consumer/zodihottaptravelshower.html

ChrisR in SF -- who 'bathes' by heating water on the stove and mixing it
with colder water in two 1-gal jugs.  You figure the rest out :-)