Hi lostnewbie,
I fear I can only answer 🏈 and 🏀 - see also my previous post right above yours!
As you're quoting prices in AU$, I assume you're in Australia, so:
2. It's possible, but it will be expensive for you. The physical (disc-based) Deluxe Edition is not available in Australia and Europe, only in America. So if you absolutely want the disc-based Deluxe Edition, you will have to order it from (for example) Amazon.com, and have it shipped to Australia.
See http://www.amazon.com/Dragon-Age-Inquisition-PC-Deluxe/dp/B00JUI8HJ4/ for more info.
3. Again, that depends on what country you're in. In the Americas, the Inquisitor's Edition has the exact same digital content as the Deluxe Edition. In Australia and Europe, the Inquisitor's Edition does NOT include the bonus content that is in the Deluxe Edition (apparently for the same reasons why there is no disc-based deluxe edition in those countries, even though there IS a digital Deluxe Edition available through Origin). So in Australia and Europe, the Inquisitor's Edition actually has LESS digital content than the Digital Deluxe Edition.
I hope that helps.
