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I buy my wild Alaskan salmon here in Seattle & have to spend anywhere from $9-19 to do so depending on time of yr. and species. I wouldn't buy fish from Wal-Mart no matter how low the price. Not every American can get such superb salmon for themselves. But this fish can be found in many places. Yes, it's expensive. But I'd suggest if you're buying Wal-Mart fish that you eat fish less, but go to a real fishmonger known for the quality & freshness of his/her fish. Pay more, eat it less. Enjoy it more.
Farm raised fish tastes nothing like wild fish. It's worth spending more to find out the difference.