Welcome Nifty.
I know that Bintel sell a range of astrophotography gear (knowledgable guys, good prices & service):
https://www.bintelshop.com.au
Some other options (assuming you know the product you're looking for) are to simply buy directly from O/S manufacturers/suppliers, or purchase 2nd hand from folks who are trading up (eg. eBay, IceInSpace classifides).
I'm expect you'll have some fun, especially from your excellent location.