See
FPCTraffic - The $1.75cpm popunder traffic is especially good for feeding TGP sites. Some buyers report a prod ratio of 120% with it.
Or, if you don't like console traffic, see
FPCClicks for clicked traffic as cheap as $3/1000 clicks.
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AdultAdBroker - Buy and Sell Your Flat Rate Banners, Links, Tabs, Pops, Email Clicks and Members' Area Traffic - updated November 2025