Daz3D
RDNA
Poser Pros
3D Commune
Content Paradise
http://www.lluque.com/3dcart/

There was a thread created with a list of private stores too. Unfortunately I can't find it. Maybe someone else remember it and be able to provide the link.

There are also lots of free character sets around for V3, V4, Aiko. Plus some for M3, David, SP3 and Hiro, but not as many as for the first 3 female figures.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi