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I can vouch for clicksor, I haven't tried the popunders from the other companies listed here though. Clicksors system is nice because you can easily set up your own house popunder to be triggered too along with the ones you sell. And complete control of when you want them triggered. Very easy to get them to upgrade you to a premium account too if you have decent traffic, plus they're good for mainstream as well. Paid me like clock work for years.
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