The term 'SHUTTERBUG's supply' refers to the materials necessary for a photographer, or SHUTTERBUG, to take pictures. The crossword solutions for this term are FILM, which is a type of photographic medium used to capture images. FILM is made up of light-sensitive chemicals that react to light and create an image on the FILM. It is usually stored in a light-proof container, such as a canister or cartridge, and is available in various sizes and speeds.