If you are a CVS shopper, did you know that you can potentially earn free ECB? CVS has a program called the Advisor Panel. They send out surveys typically quarterly, in which you can earn various amounts of ECB. I actually received an invitation the other day to do a $10 ECB survey, but did not qualify! That really stunk!
If you are interested in checking this out, you can sign up here. Make sure you add the email addresses they mention, to your contacts, because they will go to your junk folder and you'll miss those opportunities!