[skybrian]

I like Teensy but it looks like their boards are either low-inventory or out of stock too:

https://www.pjrc.com/store/teensy41.html

[djmips]

Says one SKU of 4.1 is available with limit of 5 per person

And meanwhile the 4.0 is in stock in all SKUs with limit of 20! per person. https://www.pjrc.com/store/teensy40.html

This is pretty available. Especially compared to Pi

[squarefoot]

Also, Mouser expects 712 in stock within one week.

https://www.mouser.com/ProductDetail/SparkFun/DEV-16771?qs=v...