How can i get 120V to power a couple of par can lamps without being plugged into the wall?

if u could get a hold of 10 x car batterys x 12 volt = 120 volts

you would need to make a safe place to put them.....

but safety in mind, i would look around for a similar bulb of lower voltage, that may work for you..say 12 volt halogen from a car.. it would be quite easy for most technicians to swap the bulb holders..

what i would do is use a deep cycle battery thats 12 volts and and get a small inverter of at least 150watts and that should workout now if you want continuous power all day without using a wall outlet then get an additional solar power that puts out 12 volt of at least 21 amps and that should charge the battery while powering your lamps,

Good luck

extension cord