Because Morello is an experimental platform, only a small number were manufactured. They are/were allocated mostly to people involved in early stages CHERI R&D and, AFAIK, none were made available to the general public. [That said, I don't know whether there are still some unallocated machines!] One can fully emulate Morello with qemu. While the emulator is, unsurprisingly, rather slow, I generally use qemu for quick Morello experiments, even though I have access to physical Morello boards.
