Does anyone know if any of the classic porn stars provide?  I'd love to see Amber Lynn, Ginger Lynn, Nina Hartley, etc.

I believe Nina Hartley and Ginger Lynn are available do a search fairly recent post from or about Ginger- Amber Lynn used to be, not sure if she still is

Well, I guess it depends on how far back you go to mean "classic."

Three others, in addition to the ones Eddie mentioned that are currently providing:

Debi Diamond, Tammi Ann and Chenin Blanc