In the 60's I knew folks that worked for NCR out of Dayton.
Mom used to drive dad mad when grocery shopping. All the canned, boxed and packaged goods were priced with a sticky label from a price gun. Mom would take forever in the store as she would dig behind all the goods on the shelves to find items that had been pushed to the back that still had last weeks lower price tag on them.
She was and still is a great bargain hunter.
PS: dad got to where he would drop her off at the grocers and he would step around the corner to the American Legion. This was before cell phones so she would use the store pay phone and call the bar to let dad know she was done.