Thanks for the tips Scott.
Actually I got my quote back from 80/20 Australia and the main extrusions are about AU$125 (US$110) each plus about AU$35 shipping for 3 of them and the 125 t-nuts. So total for the lot inc shipping is AU$475 (US$420). I must admit a bit less than what I was expecting, but more than I had hoped for
Above prices are ex GST