Sure, all the time in season. Not as good as my own fish, but tasty. Quite dear now that it is hyped, as Drew points out. I'm not even sure of the pedigree anymore. I think some stores call any dark salmon "Copper River" so they charge more, as it's not really a legal appellation, although I think we could get them for false advertising.
Funny thing is some tasty salmon are "white" kings - meat is quite pale, and the average land locked joe would hardly recognize the meat as salmon. Flesh color is a matter of the fish's diet primarily and genetics secondarily.
You know of Albertson's? Nothing special, really.
Drew - Landlocked steelhead = Rainbow - true enough, but funny perspective!! (Must be a CO thing!) You guys have Cutthroat (at least up in Yellowstone) - that's some good eating. Now check out sea run Cutthroat Trout.