Multiple Domain - Duplicate content - need to understand

Hello all - I'm wondering if anyone can throw some light on this...

We have an online gift store (www.redwrappings.com.au) and we also
have a domain (www.redwrappings.COM) which points to the same site.

We dynamically display different prices based on which domain the user
gets in to the site from.... so if it's .COM it'll display USD and if
it's .COM.AU it'll display AUD.

Now my concern is that Google apparently has indexed mostly .COM and
not as much of .COM.AU - I think it's because of the duplicate content
filter.

But essentially when people search from within Australia, we want
the .COM.AU results to be shown and it only shows .COM

Could someone advise what's the best way to handle this? What do we
need to do in order for Google to recognise both domains equally?

Any help would be much appreciated.

Thanks

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