Soooooooo .... I hate spending $$ if I don't have to!
My light box is an old drawer (or you could use any drawer).
Flashlights in the drawer and a piece of plexi over the top.
(when I first used a drawer, I just used one of my quilting square rulers)
Painters tape to hold the original in place.
Clamps to hold the fabric on the outer edges.
Painters tape where the clamps won't reach.
And .... when I need a flashlight .... I always know where to find one/them!!