The town where we live, Ashland, VA, is 150 years old and there is a family-owned grocery store in town, Cross Brothers (no web site), that has been run by the Cross family for generations. They have an index card system and if you don't have the coin with you, you simply put it on your tab. You buy your groceries and, if you like, they deliver it to your place. Or you can call them up and tell them what you want and they deliver it. An interesting place and one with a loyal customer base that has been able to survive the onslaught of the nearby chains. Though their selection is not as vast as the chains, they custom cut meat and have all of the basics. If there is something in particular that one wants, they will stock it.
As would be expected, there is more banter at this store and quite a few senior citizens present but the family is good about having enough people at the register so that if someone wants to chat awhile, they step aside and another family member/employee takes over another register.