SD card specs seem to change more often than the those of the cameras they go into. The king of the SDXC format this week is SanDisk with its just-released 64 and 128GB SDXC cards; the 128GB card is the world's fastest with 45MB/s read and write speeds. If you decide you need SanDisk's brand of ultra high-speed data transfer in your life, you can plan on paying $199.99 for the 64GB card or a whopping $399.99 for the 128GB version. It would seem unlikely that someone using SD would be speed-critical enough to drop this kind of money on a card, but SanDisk is marketing it to 3D video shooters, who have much larger file sizes to deal with. To the truly awesome SD card users out there — we salute you.