Vocal Point, Kraft First Taste and others I have mentioned before, you should really join Pssst. Pssst lets you sample new General Mills products as well as offering great coupons. I received a coupon for a FREE cup of the new Yoplait Greek Yogurt yesterday.
When I say samples, many times these "preview" sites give you full size product samples. What a deal! Remember to fill out any product review you might be asked to do (they are usually really short) to keep the freebies coming! Free product is certainly a great way to reduct your grocery costs!