These links might be useful
http://www.salesmountain.com/default.asp?BID=1037
http://www.shoppinglist.com/?_from=b%3dgoto1

They are both services that let you find out when various products are going on sale in your area. You input the product you are interested in (in this case the cereal) and they will e-mail you when it goes on sale in your area. Worked for me in Saint Louis on a number of items.