You could make your own using a small fan intended to keep computer processors cool:

At work, we print conductive silver ink onto polyester to make flexible circuits. To look for defects, I have set up a video camera connected to a high definition large TV. The depth of field of the camera looking at about a square inch area is not very wide so I have made small vacuum boxes using fans like the one linked to in order to create a vacuum and keep the sheet flat. The operator just moves the vacuum box around whilst looking at the TV screen to look for print defects.

Holes about 1mm diameter on a 20mm pitch would be about right. Fit the fan so it's rectangular outlet fits into a rectangular hole in the side of the box and seal round it.

This will provide plenty of vacuum to hold a piece of paper and will not pull the paper into the holes.