Where can i get craft foam for very cheap or free for mission trip? I am in Australia?

i am going on a mission trip to Russia at the end of June and we need some craft foam sheet and shapes to use with the kids.

do they have dollar stores – I have gotten some there.
how about ordering on line from Joanne’s or Michael’s crafts. You could get a 40% off coupon from these stores.

REM Summer Missions Trip 2008