Hi,
As I mentioned in an earlier thread for all the FAQ's about the Secure Digital card and also why the music industry support it (inbuild protection for coping audio for more than once from a CD to the card) and the companies which also support it or make a card.
If you compare the prices from SanDisk, Matsushita (panasonic) or PQI than you see a big cap.
rgds.
Willem