I'm not sure if cpm was available for the apple 1
but thatd be another
cheaper option is a replica-1 running cpm.
I don't know if CP/M was ever ported to the 6502, but even if it was,
you'd be stuck for software as it's all 8080,8085 or Z-80 based.
I doubt it personally. All the CP/Ms that "ran" on 6502-based systems
required some sort of Z80 expansion (C64, Apple II, and "sort of" the C128).
Actually, there was an unofficial port of CP/M to 6502: DOS65 by Richard
Leary. See: