Surely current is relative to batch size? I think it's worth a shot... 10% phosphoric acid is OTC here, concentrate that and give it a go... one amp ought to produce something given enough time, if this works at all...
One warning to others who might attempt this, 120V is not safe to play with... is electrolysis always done using DC (do we care if the ions change direction 100 or 120 times a second)? If so, you'd need to rectify the mains current using suitably rated diodes (1N4004 diodes are very common, cheap, rated for 1A 600V), and even then you have a problem, AC at 120V has peaks of +/- 168V, so once rectified you now have 168V DC (peak that is - the average would still be 120V, unless you put a capacitor across it or something). Also, limiting the current to 1A could be a challenge...