cjc2 wrote:
The CF Express cards are SUPPOSED to be the future replacement for XQD. At the moment, for a number of reasons, it it difficult, if not impossible, to find new XQD cards. If you need more cards, CG Express seems the way to go, so it would be beneficial if they were interchangeable. Best of luck.
In 2 seconds I found dozens of places selling XQD cards. Did not look too hard to me.