Our family loves Costco. It’s like everything else though. Economically wise consumers know how to purchase effectively. ;-)
Decent buy on tires. Return policy is good.
I’ve recently found better meats locally that aren’t farmed fish or artificially grown.
Computer monitors and hard drives are a safe buy.
I’ve found all the chain markets vary 2-6 months at a time depending upon commodity. Used to always shop Trader Joe’s, now Henry’s is a great source for wine, produce, and deli selections.