I'm looking at CNC EDM for die-sinking (plastic injection molds).

But I'm just start-up, with my CAD/CAM and a small CNC mill.

So can I get into EDM with something low-cost and compact that will do a good job on small work? Roughly what would it cost?

I don't know that I could launch a built-it-yourself project, I think I'd just have to identify a make and model, and look for a good price on it.