OK, so the bad news is that I can not find a printer that is willing to help with the t-shirts. The original printer whose page I found was:
A) based in the US; and
B) only willing to print one design in one colour
so really not what we wanted.
I have subsequently contacted ridiculous amounts of supposedly reputable printers who specialise in t-shirt printing and exactly 2 of them responded. One of them quoted me a ridiculous amount that I was not willing to accept and the other refused to use our designs - said we had to pick an image from their own range!!! Yeah, cos that'll work! :-/
So... does anyone know any reputable printers who can deliver a quality product at a decent rate (i.e - less than the $40.00 per shirt ol' mate in Sydney quoted)???