resin.
Is the only economical print method that can be called economical and looks as good as injection moulded.

A resin printer can be had for about $200 and the resin has come down in price recently.

But yep - glossy - yes
production quality - yes.
Economical - yes.

Of course it does all depend what YOU consider economical.
If you reckon $100,000 is a good buy - then, well we've got a few more options.

If you think $1000 is an awful lot of money - then you're left with resin :-)

And then again it depends what YOU consider to be production quality.
It it purely on the outer finish, or is it mainly structural.

If you go resin - make sure you have your own room.
It can be messy, it smells bad and the resin is pretty toxic.

If you go FDM - you can pretty much stick it anywhere :-)