I just noticed at a large local store that they had only delkin for uhs-ii available, no sandisk uhs-ii and no lexar cards at all. They previously always stocked Lexar but the entire product portfolio seems to be currently out of stock and unavailable. They said they ask every month and get the same reply: Lexar cards should be available in 1 month. So also for UHS-II there is a shortage. UHS-I performance in the D850 is disappointing. I am considering the Delkin card now to minimize the impact of dual card writing on speed. Writing JPG to UHS-I (and 12 bit compressed NEF to XQD) shortened the 9fps burst to 27/28 frames. I guess I can live with that but it would be nice to write NEF to both cards.