A roll of 12 AWG wire. Figure out how many feet of wire it would take to make one ohm.
Be aware that you'll get a significant magnetic field when passing 120 amps thru that coil of wire. Things like this were used to demagnetize color TV sets back in the early days of vacuum tube color TVs. You could wipe your credit and ATM cards with it, but there would be more important safety issues that I'd want to be well away from the coil of wire anyway.
