there is CPAstorm that has hundreds of 1 field offers. Some other good ones are Incentaclick, CPAempire, Offersquest and MaxBounty. You may want to learn more about them here: http://www.extrafreebies.com/webmasterfreebies.php
Try with any good CPA networks (Clickbooth have a lot of email and zip offers). Maxbounty also have some.