My advice would be to join a few Stargate related groups on Facebook and see what people have posted there as well ask there too. I've seen people show various Stargate related prints in the different Stargate groups from time to time but I can't remember where they got their STLs from though.
Robert James Models is working on a Daedalus for 3D printing. His models look very nice and are designed to be printed at large scale with a combination of both FDM and resin parts. He has a few free models available on Cults3D if you want to see what his models are about.
There's a Facebook group that is casting ZPM's but haven't yet posted a finished product for sale.. though they should be close to doing that. Google "Stargate Prop Facebook" and one of the links should be theirs. Currently they are also restoring a "squid" drone from Atlantis.
Yeah, I think I know the one. I signed up and received an email they'll be casting soon. Gonna be like 400Euros. I already have 2 from another maker that I've had for almost 10 years. I also got an ARG from the same maker.