Where are you buying your sanding belts?

I have just acquired an edge sander, but few questions on the belts. (6'' x 89'' - 150mm x 2260mm)



1. Where are people purchasing their belts from ? (Adelaide would be nice as its local for me or online)

2. What are the common grits to use on such a machine and their application?



I've searched the forums, but didn't really come up with anything. Any help or point in the right direction would be greatly appreciated.