The robbery happened at 9:42 p.m. at the store at Route 73 and Fox Meadow Drive.
Investigators say the suspect approached the cashier and asked for a pack of cigarettes.
When the cashier came back, the man lifted his shirt to reveal a handgun. He then ordered the cashier to open the register and give him the all the money.
Anyone with information about the suspect is asked to call Maple Shade Police.