Last time I looked at this the Coral devices were out of stock and price gouged. Looks like I can at least order now with a lead time of 22 weeks from mouser.
No worries. I picked up some nvme to make a low power frigate box when I saw the USB is often unobtainium. Figuring out the whole m.2 keying scheme vs the ports I have took the longest of it.
I found that one key type is for wifi daughter cards so I was able to save a pcie slot or nvme slot using that in the small form factor host.
https://coral.ai/products/m2-accelerator-dual-edgetpu/