General Mills is making our dreams come true! Between now and the end of the year, they are giving away 10,000 boxes of Marshmallow-only boxes of Lucky Charms.
The first phase runs through May 31. To enter, buy a specially marked box of Lucky Charms cereal and enter the code found on the inside back panel onto MarshmallowOnly.com to automatically find out if you've won. You can also request a mail-in code if you really don't want to buy a box. [Source]