$14.99
Buy it here.

I don't know why you would want to put a radio in a milk carton, but it's very cool. - Stephanie R

"This hands-on craft and activity kit allows you to turn an ordinary looking milk carton into your own real working FM radio. Kit includes a blank milk carton, two sheets of stickers, an Opti sticker sheet, and eight markers for decorating and personalizing your radio. Measures approximately 6"H x 3"W x 3"D. Requires 2 "AA" batteries, not included."