Well, I know my boss will kill me, but try following:
Look at affiliate networks, add the whole list in the extension. Now "say your extension" everytime user visits one of the Sites you added some "claim bonus" will popup. He need to click "claim". With this, you send them (legally, check affiliate networks terms) with your affiliate link shopping on their site. THIS is how to get affiliate comission, not with a few cuppons. "barrea free rev surfing"
Make sth out of it