Who was it that asked where to find Post Cereal coupons??? I can't remember so I hope you're reading this! Right now you can get the above coupon at couponnetwork.com! You should also be able to find another coupon in your 6/26 RedPlum insert.
Some Walgreens stores carry the small (9.5oz) boxes of this cereal for just$1. After coupon you can get one for free. But note that not all Walgreens stores carry them.