You could probably get one at an electrical supply store or at LOWES, ect. I have used a telco generator and probe for years. If it,s a dead circuit, connect across black and white of the wire to be traced. If it,s a hot circuit, connect between hot and ground. Telco generators withstand ringing voltages which range from 90-130v 20HZ AC.
33 yrs telco, electrical work on side.