Most people walk into Costco, grab the same bulk paper towels and rotisserie chicken, and walk out convinced they got a deal.
They probably did—but not the best one available that day.
The warehouse giant runs on a set of pricing codes and timing patterns that regular shoppers never notice, and understanding them can shave real money off an already cheap trip.
Costco marks down items using a handful of endings, and the most important one is .97.
That signals a clearance price set by the individual store, meaning the item is on its way out and the discount is often steeper than anything advertised.
A tag ending in .00 or .88 usually means a manager markdown on the last few units.
A little star in the upper right corner of a price sign means the item isn't coming back.
That doesn't automatically make it a bargain, but combined with a .97 ending, it's the closest thing to a guaranteed clearance you'll find in the store.
Costco rotates its inventory on a roughly monthly cycle, and markdowns tend to appear when a new shipment is about to land.
Many longtime shoppers report that the first few days of a new month, plus weekday mornings, are when the best unadvertised deals surface because shelves are being reset and staff are clearing space.
The Kirkland Signature house brand is the other open secret.
It's manufactured by many of the same suppliers behind name-brand products, often on the same lines, but priced noticeably lower.
For staples like coffee, olive oil, nuts, and batteries, the store brand frequently matches or beats the national label on quality while costing 20 percent less or more.
Costco's monthly savings book applies automatically at checkout—no clipping required—but the discounts are time-boxed.
If an item you buy regularly appears in the book, stocking up before the offer expires usually beats waiting.
There's also the price adjustment rule that few shoppers use.
If something you bought drops in price within 30 days, Costco will typically refund the difference.
Keep your receipt or pull it up in the app, and check back on big-ticket purchases like electronics, furniture, and appliances.
Finally, know the return policy and the membership math.
The generous return window means a bad bulk buy isn't a permanent mistake, and if your annual rewards don't cover the membership fee, downgrading or rethinking your tier can save $60 or more a year on its own.
None of these tricks require a special card or insider status.
They just require paying attention to a tag, a calendar, and a receipt—three things most shoppers ignore on the way to the checkout line.
The real takeaway is that Costco's best deals aren't hidden behind a secret handshake; they're hiding in plain sight on price tags most of us never read.
Final Thoughts
Spend five extra seconds at the shelf, and the warehouse starts paying you back for the membership you already bought.