Costco Same-Day Delivery: Two $15 Off $50 Codes This August (Regular + Business Centre)
Costco is running $15 off $50 on both Same-Day sites this August. We used our in-store price records to work out the markup — and whether it's worth it.
Two Codes, One for Each Site
Costco is running two twin promotions this month, one on each of its Same-Day sites. Both are $15 off $50+, valid August 3–30, 2026:
- SUMMERSAVE26 — at sameday.costco.ca (regular Costco)
- BDSUMMERSAVE26 — at sameday.costcobusinesscentre.ca (Business Centre)
They're independent offers on independent storefronts — one order on each site gets you $30 off total.
Key conditions:
- $50 minimum is the merchandise subtotal — after discounts, before taxes, fees and tip — and the order must be successfully delivered
- Alcohol and prescription items don't count toward the offer
- Each code: one use per membership number. Household cardholders have their own membership number — so a two-card household, with each cardholder placing a qualifying order on each site, can get up to $60 off across four orders
Is It Actually Worth It? We Know What the Store Charges
Here's the question that matters with any delivery service: how much more are you paying than the shelf price? Most people can't answer it. We can — YepSavings tracks shelf-tag prices at Costco warehouses every week.
Comparing Same-Day listings against our in-store price records:
- KS Organic Hemp Hearts 907 g — $15.99 in-store → $18.15 Same-Day (+13.5%)
- Snack Factory Pretzel Crisps 737 g — $7.99–8.49 in-store → $9.30 Same-Day (+10–16%)
So the online price ran about 10–16% above the shelf in our samples. Now the promo math:
On a $50 order, $15 off is 30% — roughly double the markup. A $50 Same-Day order is about $44 of shelf value; with the code you pay $35 plus taxes, fees and tip. Unless the fees and tip run past $9, you come out ahead of driving to the store — before counting your time and gas.
Two things people get wrong about the markup:
- In every case we checked, the markup scaled with the price — sale items were marked up proportionally too, so buying discounted products didn't cost extra.
- There's no $25 small-order surcharge here. That fee (on orders under $250) belongs to the Business Centre's traditional truck delivery at costcobusinesscentre.ca. Same-Day just has normal Instacart-style fees at checkout.
After August 30, the codes are gone and it's back to paying the markup — about 13% on the items we sampled — for convenience.
Are the Online "Sales" Real? We Checked the Shelf Tags
We spot-checked nine sale items against our price records. Eight of nine matched an active in-store promotion exactly — same dollar amount off, same end date. Here are four of them, next to the actual warehouse shelf tags:
Same discount, same end date, marked-up base price — the online sale tags are real warehouse promos, not made-up online discounts. And for one item whose in-store promo had already ended, the online listing was back at full price when we checked. Caveat: that's a nine-item, single-day check — we can't promise every listing works this way.
Stack It & Save a Bit More
- Executive members: official standing benefit — $10 instant credit every month on an eligible order of $150+, at either Costco on Instacart or the Business Centre Same-Day site. One credit per order; doesn't roll over — use it or lose it.
- Amex Platinum, Gold and Cobalt cardholders get a monthly $10 Instacart credit as a separate card benefit — whether a given order triggers it depends on your card's current terms.
- Pick a scheduled delivery window instead of priority delivery — it usually shaves a couple of dollars off the fees.
- Paying with an Instacart gift card? Redeem it inside the Costco Same-Day site, not the Instacart app — based on shopper reports, balances don't transfer between the two platforms.
FAQ
Do I need to visit a Business Centre? No — order online and Instacart delivers from a Business Centre serving your postal code. Home addresses are fine on both Same-Day sites.
Membership required? Yes, linked to your Same-Day account.
Where does the code go? The payment step at checkout.
Prices checked August 12, 2026. Verify current offers on the official sites.