Someone makes them and you would think they would want to sell as many as they could. So why not list the individual components for sale. If Radio Shack was still a big box store, I am sure I could get one there.

OK, the 12V lawnmower battery is not enough voltage. Looking at the info on the new set, here are the specs. The string is rated at 2.4 watts (0.02Amps). The supply is house power... 120 volts and the fuses are rated for 125V, 3 amp.

What determines the power draw? How many LEDs there are or is the rectifier also a power limiter?