Krypton is a noble gas and so it does not react with other elements. It is perfectly content with it's 8 valence electrons.
Fluorescent Lights
Krypton is an important use in high-powered, flashing airport runway lights.
Krypton is also used as a filling gas for energy-saving fluorescent lights and as an inert filling gas in incandescent bulbs.
Flash Photography
Krypton can be found in professional flash photography where explosives are called for typically movies and television shows. You would want to make sure that nothing is to be burned so an inert, non-reactive, gas like Krypton is used.
Measurements
Krypton was used to determine the length of a meter. Scientists stated the orange-red spectral line of the krypton isotope 86Kr was equal to the length of a meter. Over time, scientists concluded that the length of a meter is a specific distance that light travels in a vacuum.
Krypton's spectrum (Krypton Element Facts)
Lasers
Because krypton is a noble gas and inert or non-reactive. It is found in lasers, but more likely in laboratory than in a store.
A krypton-ion 568 nm tertiary laser used in protein research. (Krypton Element Facts)