PPC Feed Provider

I run a marketing company, and I’m looking for a 3rd party company to provide a PPC ad feed to fill in my ads when they are unsold or blank. Just "Run Of Network" PPC ads. I know of ABC Search, and a couple smaller companies already. Does anyone have any suggestions or are there any such companies on DP?
Thanks,
Ben
Text Ad Market, LLC
http://www.TextAdMarket.com

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