Frozen fish can be a great value.
Tornetta sells frozen wild Bristol Bay sockeye salmon when fresh wild salmon are out of season. “I also sell imported frozen―but not gassed [carbon monoxide used for color retention]―fish fillets like Greenland turbot and mahimahi.” Ask your seller for guidance when considering frozen options. Some processors use tripolyphosphates, a type of phosphate sodium preservative that increases moisture in frozen fish fillets (which may be defrosted for sale). The price may be lower, but you’re buying water and preservatives along with your fish.