The fact is there is no shortage of salmon. As it is the only way I enjoy it is sashimi.
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From what you wrote, it seemed as if you were. There is a shortage of fresh Pacific Coast salmon est of the Rockies - salmon are frozen, not actually fresh, then spend time being repeatedly chilled and thawed in grocers’ cases, slowly rotting.
If you enjoy sashimi, then you would want the freshest salmon available - not found in grocery stores or most Japanese restaurants ; there is a vast difference, which is why West Coast salmon (Sockeye, Chinook and Coho) command such a high price in Japan.
Only salmon I can find these days is Farm-Raised, can’t find Wild Caught Sockeye anywhere.