Is there recommendations as to where to buy quality and well priced sanding discs for the Random orbital sanders in my case 150mm in Melbourne?

I was going to buy from the Sandpaperman as he is a sponsor but on a $14 order there was almost $10 postage which seems to me to negate that as an option. Maybe if i was buying in bulk it work out. Just trying to get my first lot of paper and need just a few discs stepping through the full range of grits.

Also I am eager to get them as I want to finish my first large size project (Hall Table) at present it is sittin there next to the ROS I got for xmas mocking me