I got one yesterday for $5.00 it's pretty good. It's low resolution but surprising fluid.
It's hard to find porn apps on it though. If you see one on say, i definitely recommend buying it.
You could even print out a layout and stick it on a piece of cardboard to make it yourself.
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we did however see how to take a CD case and cut four semi-triangle (crop the top off each one by scoring it with a box cutter)) and make 4, glue them together to make a triangular box, then if you sit it on top of an old phone or tablet with video, it refracts the light into a 3D hologram.. I always find it great when I fail at finding one thing but learning something even cooler. I don't know how this applies to the cardboard sex poster.. but the hologram would make beer pong more interesting trying to bounce the pong ball in. (I left that one open for you)