We had a very exciting email from Shopify this week with an announcement many of our larger clients will be excited about. You can already manage multi region / multi domain Shopify sites from a single account but until now you couldn't set product price per store. Many of our clients have a .co.nz and a .com.au running from a single account but couldn't set specific price per currency until now. This feature is available on the Shopify advanced plan and Shopify Plus.
"Merchants can now control their pricing per region all from a single store. From the beginning of March, Merchants using Shopify Payments have access to 'international pricing'. They will be able to control the pricing in different countries and/or regions and display the individual product prices either inclusive or exclusive of taxes depending on the location of the buyer."
For specific changes and international pricing options see the International pricing doc.