If you have any empty cassettes with the ISO value you're needing (non-reloadable), I've read of someone who simply cuts out the DX encoding strip and tapes it down to her reloadable cassette using double sided sticky tape. I looked at First Call Photographic as well, thinking they might be happy enough to send it to Australia and I could simply send them on to you...but for 84 pounds, sorry, can't help you there. You'd think they'd be nicer to their 'loyal' colonies, wouldn't you?