Stumbled across these breadboard plates doing a project for work and thought wow maybe the CNC zone people might appreciate seeing these. We bought a 10x12 to make a laser marking machine fixture. It was like $100. Tapped with 1/4-20 hole pattern and black anodized. We couldn't begin to make these in house for that price. I was plotting to make one for my Tormach but now I might just put one of these on my xmas list
(I have absolutely no relation to this outfit other than buying one plate for work)
Base Lab Tools - Optical Breadboards Tutorial