>>285192029
Check out booth.pm for Japanese-style premade ready to upload ones. There's a massive event coming up called Vket 4 that has like ~1400 exhibitors and there'll be a bunch of new ones.
>>285192248
MMD models probably. I'd look at deviantart for western-style stuff, but honestly don't know that much when it comes to furry models. Lexidoll is a popular base for Nanachis, the only one I could name, unless you include 10%ers like Seikis or a lot of Booth models.