Fake eyes
If you are tired of people entering your store and shoplifting, there is something you can do to stop that from happening, or at least help decrease it. But keeping eye contact with people in the store or even putting up posters all over the place of just eyes, can deter people from stealing.
They will feel as though they are being watched and think twice about taking anything out of the store. It seems crazy but give it a try if you can not afford a camera and no other security measure seems to be working. You can always hire more people to watch shady characters as they browse.