Some of the names mentioned in this thread are available as SPs through PornCompanions. A trusted source has seen Gianna Dior through them. Seems legit. Caveat: you may need to travel to the US for an appointment.
Violet Summers...She did do some porn but she is not that popular on porn sites except in some scenes. She does have a site with her material but there are a few sites from other people that do show her pictures and videos.