What are shipping costs like?
As an example, the creatine I got was $5 more expensive else where but no shipping costs, same for my bulk WPI box, 4.5kg, $5 dearer at aminoz but no shipping cost (or already rolled in).
and you get reward points at Aminoz tp spend on the next purchase, negating the $5 difference in many cases.
EDIT: just saw this - http://www.proteinking.com.au/Delivery-Info
I'm better off else where, may be different for your products though.
You also score bonus junk if that matters at Amino, shakers, tape measures etc, random junk but it's free so who cares.