Found this on another forum. Mine arrived today, and it's FREE. http://www.hornsby.nsw.gov.au/community/common-enquiries/traffic-and-transport/motorcycle-crash-card
I have seen these before. I would prefer to have a holder on my jacket though rather than have my helmet removed. Sometimes (and in the case of untrained people) it is better to keep the helmet on til you arrive at hospital. I have considered making a card for the inside of my jacket.
the sticker on the crash card has "do not remove helmet" on it, i think the idea of having the card in the helmet is less likely it will be damaged or come off, unlike on a jacket at times.