How can I buy FB accounts and groups?

I really want to buy FB accounts and groups to add to my current groups that I promote. How can I find people who are selling them?

I need real, non-interlinked accounts / groups that have both males AND females (i.e. not just hot chick accounts that have all guy followers).

Willing to pay real $.

I am able to provide you

Have you tried the buy sell trade section of this forum? Should be loads there.