FWIW A used color DMD will still set you back $350-375 for a LCD IMO. They hold value well and supply seems to dry up from time to time.
I'm thinking $400. used, as when I tried the same thing.

people pull them and take $400 off game asking prices. 1 of the few mods that won't tank anytime soon.
I ended up buying when stock came back, which is often.

I would like 2 more, but not anxious for those games to have color (not planning on keeping either one)
avengers uses an LED display.