Other PiBox / KubeSail cofounder here. I put in an enormous amout of time into designing around components that can be easily sourced and are stocked regularly. A good example of this is the SL2.1A USB hub we use. The datasheet is in Chinese, but after testing it on several prototypes, we saw great reliability for 1/10th the cost. And its always in stock. Currently Microchip USB hub chips are either out of stock everywhere, or cost $5+, which doesn't make sense for low-cost Pi accessories.
The only issue we still face is sourcing actual Raspberry Pi compute modules. There's very little we have control over there.
The only issue we still face is sourcing actual Raspberry Pi compute modules. There's very little we have control over there.