where can I find a list of paysites by niche/category?

[airpal]

For linklists, where do you get a list of paysites organized by category/niche? Doing this manually is very time-consuming and I assume that there is someone or some product/service that offers constant updates of paysites categorized by niche? Its a service or product I'm willing to pay well for, if someone knows a source.

Thanks for your help.