I run my pi-hole instances on Arch Linux thanks to the folks who maintain the packages in AUR. One of my instances is indeed a Raspberry Pi (2B+) but the other

I run my pi-hole instances on Arch Linux thanks to the folks who maintain the packages in AUR. One of my instances is indeed a Raspberry Pi (2B+) but the other is an older Intel NUC (with a number of other services running). RPi is probably one of the cheapest options, though.