Off topic I know, but I have argued for years that FF should have a second income stream from selling content outright, alongside the subscription...maybe sets of 100-150...assorted people, vegetation, furniture, lighting and ornamentation etc. It's my personal view that we ignore a large part of the market by not doing so...but it's not going to happen.
There are, admittedly, a few very good reasons for not doing this...one of the strongest being piracy. We actually suffer from an extremely low attrition rate, resulting in very little of our content appearing in the 3D Warezhouse and other such places. This is because our subscribers are overwhelmingly loyal and protective. I know a whole bunch of my people appeared on some Thai site a few years back, but they weren't actually from FF, they were from my original 3D-Figures CD which predates FF...which kind of proves the point about piracy of retail content. Those figures go waaaay back and are very low poly. Their FF versions have been undergoing a rolling program of QA overhaul.
It's quite sad for the SU community that retail content doesn't seem to be able to last the course. I think it's largely a question of economic viability. The lower poly content required by SU often requires just as much work as the higher poly. I could, for instance, build a high-poly tufted sofa, using Soapskin, Artisan or TIG's Extrude tools, in much less time than it takes to craft a low-poly one. Yet I couldn't get away with charging anything like the prices asked for such high-poly content on places like Turbosquid.
Over the years we've had a few people...some from SCF itself, asking if they could join us...because the excellent content they were providing for the retail 'shop window' sites just wasn't selling. The attitude still prevails that it's more economic to waste countless otherwise-billable hours scouring the net for freebies, often followed by yet more hours cleaning them up, than actually taking the relatively minor financial hit of buying or leasing them. This has all the economic sophistication of deciding to walk the 10 mile commute to work every morning in order to save the bus fare or fuel cost.
It seems to be the case that the only substantial retail SU content site to have lasted any real length of time is Susan's Entourage Arts...and that is somewhat different being entirely 2D. The only other long-term SU content site with masses (ie thousands) of 3D models would seem to be Dynascape. It's not insignificant that they too have a subscription model.
Back on topic: One needs to look no further then the thread containing the links to 3D resources. That's been added-to for years. If it ain't there it probably doesn't exist. In fact some of those sites may well be now defunct.