Love my light boxes. I bought one and made another by using the old fashioned one-function scanner that someone gave me after it broke. You take its insides out, velcro a flourescent light of the right size to the hollow core, stick the cord through a convenient hole--there will be several in the hollow core of the scanner or you can easily make one--and voila', you have a light box with a cover.
Those old scanner are hard to find now, but you might find one at a garage sale for less than a dollar.
froggyintexas