Hey, I belong to this one!  It’s great and usually closed to new members.  Nielsen Home Scan sends you a hand scanner just like the grocery stores use and you scan your purchases.  Once a week you transmit the info and earn points; they also have surveys.  It’s actually fun (Rachel says I just do it to skewer the results, since most people don’t buy 358 cans of Seattles Best or 440 bottles of Vitamin Water.  there just might be a touch of truth here).  Any interest, better hurry ’cause this one goes fast.