The robbery, which happened at 12:10 a.m. Monday at the store located at 3216 North Broad Street, was caught on surveillance camera.
Police say the suspect approached the counter and handed an employee a threatening demand note.
Then, the man allegedly pulled out a hand gun and demanded money.
The employee opened the cash register and gave the suspect $150 in cash.
The bandit then fled the store on foot south on Broad Street.
The suspect is described as a black male standing in his mid-to-late 20s, standing about six feet tall weighing 170 to 190 pounds.
He was wearing a gray hoodie and dark pants with double stripes on the side.
Anyone with information can contact the Philadelphia Police Department at 215-686-TIPS or through phillypolice.com.