/3dpg/ is probably the place to ask.
understand that etching, engraving, and cutting are three different things and will require three different setups.
without going bottom-of-the-barrel amazon chinkshit, you're looking at between $600-$1k per machine. or you could get something like a snapmaker, which 3d prints, has a cnc router, and up to a 10w laser head. people will shit on it
>hurrr it does three things so it does none of them well
it does them well enough. i have one and use it for all three functions in a professional environment (not my garage) and get good results.
my only complaints about it is that it's slow, and i wish it had more useful accessories. (e.g., a tool setter for the router, or even an auto tool changer.)
the 3d printer prints. not much to say about that.
the router will do wood and plastic and shit all day long. i've done aluminum on mine - cutting panels for switches and d-sub connectors and shit into 3/16 box tube.
the 2w laser will just etch/engrave acrylic and wood and shit. the 10w laser will engrave softer metals (brass, aluminum) readily, but stuff like steel will require prep, either ceramark spray or other surface conditioning in order to take an etch.
i'm happy with mine. it was a good babby's first cnc, but i've already outgrown it.
kids just fucking around to learn it should be fine.