How do silver Kookaburra coins sell cheaper at USA bullion dealers?

Does any one have an explanation on how USA dealers sell random year 1 oz silver Australian Kookaburra coins at AU$51.50 but Australian dealers sell them at $56?

 

May bee the GST.
I remember in 2009 I bought a few hundred Lunar 2 Ox in the US because it was cheaper there.

 

I do not think that Australian bullion dealers have to pay GST on Kookaburra coins. There must be some thing else that increases cost for doing business inflicted on Australian dealers.

 

Was it cheaper even after paying for postage to Australia !?

 

Yes it was also other coin in it and buying few hundred on 10% cheaper ads up

 

I think the USA and Europe buy 85% of these coins so therefore pay less.

 

They are priced as generics here.
Same with Canadian Maples, Krugerands and any other Euro stuff. It's usually the cheapest bullion you can get around here.
There isn't much of a premium on any of that normally.

 

Another thing to consider is I believe is much more competition in the bullion and coin business compared with Australia. In my town/city no dedicated commercial premises. On the rare occasion Cash Converters might have a few overpriced items!