There are two or three that I've found in the US (an older list is here https://en.wikipedia.org/wiki/KaiOS#Devices https://en.wikipedia.org/wiki/KaiOS#Devices)

There are two or three that I've found in the US (an older list is here https://en.wikipedia.org/wiki/KaiOS#Devices https://en.wikipedia.org/wiki/KaiOS#Devices). They mostly seem to have bad reviews, and they aren't cheap here compared to older Android phones. I think your best bet is a cheaper feature phone, though most in stores are carrier-locked, so you may have to shop for an unlocked one online.