The masked robbers entered the store, took an undisclosed amount of merchandise and fled the scene, police said.
Just before 10:30 a.m., the two suspects went into the business at Fifth Street and Long Beach Boulevard and demanded cash from the register, police said.
Detectives are trying to determine if the suspect involved is the same suspect involved in prior incidents at the location a police spokeswoman said.
Detectives hope that by releasing security camera footage, someone will recognize the man and report him.
This is the second time in two days that a meeting for a sale turned into a robbery, according to Long Beach police.
When the male victim met with the expected buyer, the buyer pointed a handgun at him and demanded money, police said.
The suspects, wearing dark clothing, held up the store using a short-barreled shot gun and a knife shortly before 2:30 a.m.
A manager at a Downtown juice shop chased an armed robbery suspect after catching him taking cash from a register Sunday afternoon.
The two separate robberies happened a few days apart at Target and Home Depot stores in Signal Hill, police said.
Darrell Tatum, of Long Beach, was charged on Monday with six felony counts of robbery and six firearm enhancements, according to police.