where the fuck do you find good adult content in bulk?

I need to find lots of content I can license for use on my adult website. The girls should be at least mostly good looking. The prices should be reasonable. I don't want to be nickel and dimed for a video here and there I need to buy like a hundred to a thousand videos at a time at a volume discount. I need videos and photos in the following categories:

Amateur
Anal
Asian
Blowjob
Ethnic
Fetish/BDSM
Girl-on-Girl/2Girl
Group
Hardcore
Solo
Teen

I actually haven't had much trouble finding what I'm looking for in the amateur, girl-on-girl, solo and teen categories but the others have not proved so easy and I have spent a lot of time looking at content providers' sites without finding many deals for volume purchases. How do experienced webmasters find a lot of good content in those categories at good prices?

btw I am dealing with a format where I can't use plugin-based content, I really need to buy/license content for conversion to my delivery format.