You have blamads and leadbolt for instance, check affpaying.com for more

Are you looking for a content locking script or network?

ContentLockPro, they have a thread on WF.
Its not a CPA company, but it is a content locker that allows multiple networks. One of the best available.

BlamAds, LeadBolt, CPALead, AdscendMedia, etc.

They are incentive-friendly and they provide you with their own Content Locking scripts.

Good luck!

Guys thank you so much for the help!

If I want to use multiple networks but feed the surveys through 1 gateway/content locker, how can I do this?

Much appreciated!

What you will need is a self hosted content locker. Then you can promote any offers that allow content locking from any network.
Do a Google search for self hosted content lockers and find one that will suit what you need. They all appear to have different user interfaces and capabilities, so I can't tell you exactly how you would do this as it would depend on the content locker you are using, only that you can do it.
Almost all of the self hosted content lockers will come with instructions, demo vids and support.

Get ready to get paid again with Content Lock PRO V2.0