There have been a few threads here on lenticular lenses.  I've tried to find printers, but they seem to mostly have shifted to a quantity rate where a single image can sometimes be 10X the cost of printing a batch of 25.

An alternative is buying some lenses and printing the images on a laserjet. I found a couple of freeware versions of software to break an image up for a lense, but haven't tried them.
http://www.matthiasm.com/lentils.html
http://lentikit.sourceforge.net/index.html

My visual indexes of Poser content are at http://www.sharecg.com/pf/rgagnon