Halloween Spirit and Halloween City opened up across from each other this year! Halloween City was scrambling to get things out. Found this X-ray lights string for $12.99. It looks better than I expected. Made by Sunstar Industries, Inc.
Only 2 images the skull and hand. Printed on a heavy acetate. You might want to shop around as the prices vary. Found them at OTC.
The images with no lights can be found here. Plan to try the images stacked in a vase or stuck in a window with a light source from behind.