Sandisk has announced that they too will be releasing their own 4GB Memory Stick Duo Pro. The proclaimation was made a day after Sony officially announced their launch of a similar product. Naturally, Sandisk--now proudly bearing the crafty underdog image have come to relish in the flash memory arena--mentioned that they will be selling their 4GB Duo Pros in March for $239.99; two months earlier and ten dollars cheaper than Sony's.