For those of you who just want the Standard edition, and don't want to pay the $69.95AU on us.battle.net
I knew in USD the standard edition was $40US (~$55AU) but couldn't find a way to purchase in $USD on the us.battle.net. Then I found out that the Taiwan battle.net was also ~$55AU ($1300NT) for the standard edition.
Just change the region in the top right of the page to Taiwan, and you can purchase it for cheaper. The game will appear on your account as the global edition, but when you play you can just change your region back to the Americas (which includes Australian servers)
Edit: So the Korean price is cheaper 45,000 Won (~$52.36 AUD), but you can only pay via Battle.net funds which apparently takes 3 days to appear when using Paypal. Not sure if those battle.net funds need to be in Korean currency, or you can have any currency in battle.net
Note: I paid using Paypal, but people in the comments appear to be having issues. Another comment says there could be issues with AMEX cards.
I saw that it was $45,000 Korean Won as well just in case it might help. Missed beta due to work :(