I bought some standard chemicals for D76 and like processing, on Saturday from Vanbar.
Their website has an extremely extensive list of chemicals, but some are missing for the more esoteric processes.
However talking about this on Saturday I was informed that there is a listing for the website and there is a complete listing on their system.
North Melbourne is where the chemicals and possibly their chemist actually are located. I would suggest you telephone after looking at their web site list.
The prices are quite reasonable, especially if you pick up, instead of getting delivered via Australia Post or whatever.
I telephoned and ordered at their Carlton office two Fridays ago, they telephoned me on Thursday to say the order was filled and ready at the Carlton store for me to pick up, which I duly did two days later.
They don't keep chemicals in the different sizes, they are all bulk and they weigh out peoples requirements to order only.
Quite good service I believe.