Police are hunting an armed and hooded raider who threatened shop staff and made off with the takings.
It happened around 8.20pm on Sunday at the Premier Store in Ballantyne Street, Innerleithen.
The man brandished a knife at staff before fleeing with a three-figure sum of cash.
Detective Sergeant Colin Chalmers said: “This was a terrifying experience for the staff to endure and we are eager to trace the person responsible as soon as possible.”
The suspect is white, around 5ft 8in and stocky. Staff told police he was wearing a waist-length dark coat with the hood up and a white woollen hat. He spoke with a local accent, according to the workers.
Sergeant Chalmers added: “We are keen to speak to anyone who was in the area and who witnessed anything suspicious or who recognises the description of the suspect.”
Information can be passed to Police Scotland on 101 or with anonymity to Crimestoppers on 0800 555 111.