Chowhounds are revealing the best stuff to get a Costco, and some things to avoid. Good: Kirkland meatballs, French feta, king crab, Bolthouse Farms carrot juice, Sabra hummus. Bad: teriyaki chicken meatballs, marinated Alaskan salmon prepackaged in individual servings, sushi (too gummy!), chile verde (too salty!).
Chowhound Eugene Park writes: “Not sure if this is available in all Costcos, but I’ve bought black truffle butter from the San Francisco & Foster City locations. Best $8.99 I’ve spent in some time. Makes even plain Jane french bread taste amazing, esp. if the bread’s been sliced thin and toasted.”