Yes, I know where you can buy them for mainstream. Including FB and segmented verticals.
It's not enough to purchase a list. They must be double opt-in to be CAN-SPAM compliant.
Additionally, you would want to do data verification on any purchased list.Which would eliminate the complete garbage. Ideally, you would want to have any lists broken out by demographics if they do not come that way. There are companies that do all of this stuff for you.... for a price of course.
Good luck champ.
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Should You Email Your Members?
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Enough Said. 
"Would you rather live like a king for a year or like a prince forever?"
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