I think "never" is a bit of an over-statement. Back in the 40s and 50s, and even later, Humpto-Dumpty was a pretty dominant figure in OKC grocery retailing. Its founder, Sylvan Goldman (
http://en.wikipedia.org/wiki/Sylvan_Goldman), invented the shopping cart back in 1937 and that led to the supermarket concept.
Unfortunately, his sons (Al and Monte) weren't all that interested in the grocery business; they preferred real estate. After his retirement, the Humpty chain just sort of evaporated. Many of its locations later became Albertson stores.
The original Safeway chain, which morphed into Homeland through a rather extended series of bankruptcies and buy-outs, was the other dominant player in those days.
However, the Walmart saturation is, as you said, what really marked the end of top-level grocery outlets here.
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