Oh, I'm sorry, we're closed for the season. A couple of Nikon DSLRs have had "official" buffer upgrades available at various times, the most recent being the original D3. Unfortunately, these extra cost options officially ended in late July of 2011. The D3's US$500 buffer upgrade pushed JPEG Fine Large from 52 to 119 images and the worst case NEF buffer from 16 to 36 images. The D3s has the extra memory in it already and didn't need the buffer upgrade. But unfortunately, Nikon no longer has any buffer upgrades available for any DSLR. Since memory is soldered into the main digital board on Nikon DSLRs, there's no user option to upgrade memory.