I found Special K cereal on sale at Crest today for $1.48 with specially marked boxes advertizing a FREE subscription for Shape magazine wyb 5.
Here's how to get boxes for .98 and a FREE subscription!
Buy 6 Specially Marked Boxes of Special K (saw several varieties) $1.48
Use (3) $1.00 off TWO Kellogg's Special K Cereals
Final price: 6/$5.88 (.98 ea.) + FREE subscription to Shape!
The back of the box has full details on how to get your magazine.