You can get it in art/craft shops. For some unknown reason, it's expensive in Australia. What they get for $1 in the US we pay at least $10 a sheet here. There are a few place you can order from online, but that only brings it down to about $8 a sheet. I've got links to those somewhere on this site, but bottom line is that it's cheaper to buy an airframe than build one here. Sad but true