Bintel sell them, they are on their website. At least if you buy through them you get local support. Either way your up for significant GST. Worth checking with Bintel before you buy.
https://www.bintel.com.au/product/pl...v=322b26af01d5
I would point out that you can buy alot of imaging time on one of the rental scopes, for what it will cost to buy one.
It is a carbon tube, and I have not heard other negative comments about tube flex, other than the one below. Maybe ask the same questions over on Cloudy Nights, probably more owners there.