I’ll always buy local if I can get it at a similar price, and I’ll even pay slightly more for local, but I’m not going to spend 25%+ more for an identical product and Amazon’s prices usually really are that much cheaper.
In these COVID times, I've been buying quite a bit of bicycle gear & parts and in many cases I could find stuff on Amazon at lower prices than AU specialist online shops. It certainly was not the case just a couple months ago.
I reckon Prime Membership in AU is now very worth it as you get free international shipping for orders over $49, in addition to free expedited domestic shipping and Prime video access.
Local retail first.
Then again, as a country, Australia would be free in deciding that it should only be affordable to people who have the means to support their life, to maintain a high quality standard and retails.
https://decathlon.com.au/collections/climbing-karabiners-qui...
This is a really really bad look for Amazon, which is in the process of expanding in Australia. Retailers are already nervous about their expansion plans here and this does further bad for their brand.