Emma,
Not seen them but I also have an IWATA smart Jet Pro & HP-B airbrush. Got mine from a guy called Mike Tuckley - got his details from Tara on this site, got a very good deal.
You can use IWATAs for tanning but you need a differnet airbrush to the one I have. Pleased with mine so far and really easy to transport around if I need.
Not the answer you were looking for I know but always helps to get other opinions....
B