Bob Hunt sells them. You can cut one out of CF plate if you like making 10 jig saw blades dull. For profile planes I epoxy a couple of layers of thick fiberglass to 1/4" birch ply and weight it down on a glass table to make it flat.
I think that's an exaggeration. I go through one blade per handle; I think one of those motor mounts would be about the same.
Apparently there's inexpensive laser cutters coming on the market. The cheap ones are more like laser cutter kits straight from the Danger Zone (no interlocks and a 2 1/4 watt visible-light laser -- which means that all you need is to get a glint off of something shiny and you're blind in that eye). They look interesting as hell.