I was searching for these a few years back and they were hard to find then. There actually were a lot of 2/4MB cards, but they were the wrong voltage. Do not get a 3.3 volt card, it will not work! I bought some by accident and found out for sure. I ended up finding one on ebay (had a watch set up to look for it) from some odd dealer in japan for a reasonable price. That is probably your best bet because you are either going to need to find a rare used one or some place that has old stock laying around.