Bazze's cars (link above) are free downloads, for non-commercial use only.   Like all his models, they are excellent.

Otherwise, there are some fine car models available from www.vanishingpoint.biz (also at CP) and from DAZ3D (search on "Dreamscape Creations").

They do tend to be either classic, or exotic (or both), though, rather than familiar, everyday types.   I suppose that that's because creating a model of a Toyota hatchback takes just as much effort as producing a model Ferrari F40, but, in 3D-Land, it's the Toyota that is the niche product.