When I was little, I had a sticker collection (okay, I still have it). Even now I doubt anything in my collection is worth as much as this: Michigan is using this decal as part of a program to raise funds to fight invasive species in the Great Lakes. Unfortunately, it's only 3 inches square, yet costs $35. And yes, you still have to register your boat - this sticker is decorative only. Guess I won't be adding one to my collection any time soon. Read the press release here.