Earn Prizes and Coupons by Joining the National Consumer Panel

 If the National Consumer Panel is accepting panelists in your area, you'll receive a price gun with which to scan your groceries and coupons to earn points. This is a fun activity for kids to do while you're putting groceries away, and the longer you're a panelist, the better the prizes get. 

I've never participated in the National Consumer Panel, but I know that people who have have received a number of free gifts (reusable insulated shopping bags, for example) and coupons as a result of their participation.  They only accept new applicants for a limited period of time, so sign up now if you're interested!