Seems all the models are at Turbosquid or other commercial websites.

Found this on the scifi3d site:

"In order to combat theft of the sites models by others who try to sell them we are going to submit our models to commerical websites. They will still be FREE as always. Our community is full of honest people with alot of integrity, and they are adiment that models remain FREE. Therefore we are going to submit our models to places like TURBOSQUID as FREE to combat theft. Nobody will pay the theives for something that we offer for FREE. This should effectively stop this internet crime."

Hope this helps.