Yes I've obtained some kits from Photographers' Formulary to try particular processes (pyrocat, New Cyanotype etc.).
I used--when Vanbar still supplied--to then source the chemicals from them at a cheaper price.
The large amounts of sodium thiosulphate are another matter, I'm sure the freight would be outrageous for even 5 kg.
At present I'm trying to balance two hard to find ingredients for salt printing: Strathmore Series 500 paper (the best that I have found for this process) and the aforesaid sodium thiosulphate. I'm not sure whether I'll end up a pile of one or the other but not the complete kit required.
For Sydney folk there's a company in Cromer that claims on its website to have sodium thiosulphate.
Regards - Ross