Does anyone know where I might buy a hand cranked/wind up lantern? They would be like the wind-up radios which require 90 seconds of winding up & they play for 1 hour. Thought that it would be very handy for power outages & I wouldn't have to have extra batteries always on hand. I have tried the Real Goods company but they don't have any. I do have a wind up radio which I heartly recommend.