Treckfish

Free entry, some incredibly beautiful and unique opals, fossils, and nice "dinosaurs".
Staff is well informed and tells you everything you want to know and more.
...well... and guess what... they even sell jewelry... that's why it's free...
Anyway, it's definitely worth a visit!

It's good to take shelter from the rain or sun.
Some nice stalls, mostly for the ladies.
In the middle are some nice local food stalls and a burger shop.
Nothing exclusive, mostly low to medium quality, though.
If you really need good clothing, you'll want to exit in the middle heading to the coastline and dive into the streets left or right with international brands.