Costco built its reputation on a simple pitch: pay a membership fee, get warehouse prices that beat the grocery store.
That pitch is being tested right now, and the results depend entirely on which shopper you ask.
The warehouse giant has been leaning harder into limited-time offers, member-only savings events, and rotating instant rebates that shave dollars off everything from paper towels to rotisserie chicken.
In practice, it means the price you saw last week is gone, and the price you see next week might be better.
That is not a discount strategy so much as a scavenger hunt with a membership card.
Costco's average basket keeps growing, and part of that growth comes from shoppers buying things they did not come in for.
The famous $1.50 hot dog has not moved in price for decades, but it functions as bait.
You walk in for a $1.50 lunch and walk out with $180 in groceries, a patio umbrella, and a two-pound bag of pistachios you will finish by Thursday.
The math on membership itself deserves scrutiny.
A basic Gold Star membership runs $65 a year, and the Executive tier jumped to $130.
Costco says Executive members get 2% back on most purchases, capped at $1,250 a year.
To break even on that upgrade, you need to spend roughly $3,250 annually, or about $62 a week.
If you joined for occasional bulk runs, you may be paying $65 extra for a rebate you will never max out.
The deals themselves are real, but they are not uniform.
Warehouse clubs typically stock a narrower selection than supermarkets, which is how they keep prices down.
That also means when a specific item goes on instant rebate, you either buy it now or wait for the cycle to come back around.
Then there is the psychology of the warehouse format.
Wide aisles, towering pallets, and free samples are engineered to make everything feel like a deal.
A 48-count box of granola bars at $18 looks like savings until you calculate that you are paying about 37 cents per bar for something your family may tire of by week two.
Unit price is the only number that matters, and it is usually printed in the smallest font on the tag.
For large families, small businesses, and anyone who genuinely burns through bulk staples, the warehouse model can beat conventional grocery stores on staples like eggs, butter, coffee, and cleaning supplies.
Members who shop with a list and check unit prices usually win.
Members who wander usually subsidize the rest of us.
There is also a quieter risk worth naming: Costco's low prices depend on suppliers accepting thin margins and on the company keeping its membership renewal rate high.
If renewal rates ever slip, the pressure to raise prices or cut quality shows up fast.
Shoppers should watch for shrinking package sizes and swapped brands, which are the classic ways a "deal" quietly stops being one.
My take: Costco is still one of the better values in American retail, but the membership fee is doing more work than most shoppers realize.
Treat the instant rebates as a bonus, not a reason to buy, and run the unit-price math before anything lands in the cart.
Final Thoughts
It is just very good at letting you trick yourself.