Here is an email i received from Bill at Diamond Racing Wheels regarding shipping.
"The Pro Challenger is a race only wheel. The Pro Series is available
for street use. These are available in 15x6, 15x7, 15x8, 15x10, 16x6,
16x7, 16x8 and 16x10 sizes. Shipping cost varies with quantity and
size of rims. The average cost to ship 4 wheels to Australia is about
$450.00 on UPS.
Bill"
Rims i were chasing were about $85 US each for 15x8 -30