Free: Contests & Raffles.
I have a sticker on mine that says "Smile, there are 2 other cameras taking your picture"Even if there isn't 2 more cameras, the thought of someone looking for 2 non-existent cameras is funny.
A friend of mine put stickers on his cameras stating the cameras were gps equiped and were being used in a federally funded study with WSU etc. Make someone think twice about taking a camera.