There are some available on clips4sale, I'm fairly sure.
I don't think this is a small interest; rather, I think that (as a *sweeping* generalisation) women are less inclined to make videos of their partners than men. I think there are a number of great BHM/FFA couples here, including Shuefly, PiercedPrincess, ChrisVersion2, and I'm sure I'm missing other obvious active folks.
Just convince them to make some vids for ya

Well, for all of us!