Walgreens has a new program called "Walk With Walgreens". Sign up and share with Facebook (or another social network) and you'll get badges. The first badge is "First Steps". When you accept that badge, you'll get a coupon for a FREE pedometer at Walgreens.
There are other rewards too, the second one I received included coupons for Dasani water, Sprite Zero and Planters nuts. And this was all before I logged any walking!