G'Day,
Here's a link to one shop,very honest and good backup service
https://www.bintelshop.com.au/welcome.htm
Here's another 2 but I have never deal with them myself
http://www.telescope.com.au
http://www.myastroshop.com.au/
What are you looking for ? we have a great Buy and Sell right here on this site
Cheers
Arthur