The incident occurred at 2:24 p.m. on August 28th at the 99 Cent Store on the 7400 block of Stenton Avenue.
Police say a man armed with a handgun entered the store, pointed the gun at an employee, and demanded money from the cash register.
After receiving $200 in cash, the suspect fled the store north on Stenton Avenue.
No one was hurt during the robbery.
Philadelphia police released surveillance video of the robbery on Tuesday. [View on YouTube]
The suspect is described as a black male, 180 to 190 pounds, wearing a dark blue hooded sweatshirt, blue pants, white sneakers, his face was covered with a white cloth, sunglasses.
He is considered armed and dangerous.
Anyone with information is asked to contact Philadelphia Police at 215-686-TIPS (8477), text a tip to PPD TIP (773847) or through PhillyPolice.com.