That dramatic difference is no surprise. Smoked wild salmon is $13.99 a pound at Costco, about half of what it would cost at Fairway. A pound of Earthbound Farms organic spring mix is $4.79 at the warehouse store, $6.99 at Fairway. On a previous visit, I saw chunks of Parmigiano-Reggiano cheese at Fairway for $8.99 a pound, but there was no indication it had been aged 24 months like the same cheese at Costco for $9.99 a pound.
Where Costco lags is in the availability of drug-free chicken parts (it stocks only organic, skinless thighs) and drug- and hormone-free beef and pork.