It's more cost-effective to buy Kellogg's cereal and donate it to a local food bank while keeping the coupons to send in. You get 100 miles per box. The 12 oz. size of Corn Flakes, if you can find it with planes, sells in the $2 range so that's about 50 miles per dollar versus 20. Most of the others are over $3, some near $4, but still over 20 miles/$. It takes them about two weeks to post miles.