Malt-O-Meal has a bunch of $1 coupons available online, and Walmart has the bags of this cereal available for $1. This may not be valid at all stores, but there are many reports of them having this at that price. Here are the coupons:
http://www.malt-o-meal.com/walmart/
http://www.malt-o-meal.com/pages/special-offers/special-offers.php
http://www.malt-o-meal.com/cereal-central/become-a-member/b..