For those in Melbourne, I used to do some business with these guys when they were in Clayton. http://locker.com.au/general-industrial/perforated-general-industrial/ I don't know if they do off cuts, Geordi Steel does but they are expensive.
D3ft could you cut it to sizes needed and post it out to those that want it and just charge a nominal fee?
There is probably enough left for a couple of 30cm square pieces plus some small offcuts, i used a 60cm diameter piece for my pot.
Just to be pedantic, its perforated sheet and not mesh.