Are you a member of Nielsen Consumer Panel yet? I've been hearing that more people are getting accepted and the program has opened up to new zip codes, so even if you have applied in the past you may want to try again.
Once you become a NCP panel member all you have to do is scan and send them your household purchase information every week with a handheld scanner that they provide. For each week of the month NCP receives your purchase information, you will earn one entry into the Monthly Sweepstakes where you can win a $500 American Express Rewards Card. That’s up to 4 entries every month!
Every quarter they also give away $20,000 to one lucky panel member. For each week in a qualifying quarter NCP receives your purchase information you will earn one entry into their Grand Prix Sweepstakes.