Investigators say the suspect is about 5 feet 10 inches tall and always wears glasses. He usually walks in the front door of the business, pulls out a revolver with his left hand, demands money from the clerk, then leaves.
So far he has targeted three Subway sandwich shops, three Metro PCS stores and other area businesses.
Anyone with information on this suspect is asked to call the LAPD at 1-877-LAPD-24-7.
AP contributed to this report