No flash sales. No loyalty point games. Just the lowest prices, every day.
The OK Store sign. Once you know it, you’ll spot it everywhere across the Kanto region.
I still remember the first time I checked my receipt at OK Store. I looked at it once, then again, then a third time. The total didn’t seem right. But it was.
I’ve been living in Tokyo for a few years now, and I’ve tried every supermarket in my neighborhood at least once — Maruetsu, Ito-Yokado, LIFE, even the occasional convenience store splurge. None of them made me look twice at a receipt. OK Store did, on the very first visit.
This isn’t a sale-of-the-week kind of cheap. OK Store is built around a philosophy called Everyday Low Price (EDLP): the price you see today is the same price you’ll see next Tuesday. No guesswork, no strategic shopping days. Just consistently lower prices than almost anywhere else in the city.
01 — What Is OK Store, and Why Is It So Cheap?
OK Store (オーケーストア) is a supermarket chain with locations across Tokyo, Kanagawa, Chiba, and Saitama. The chain’s official tagline is “High Quality · Everyday Low Price” — and they mean it literally.
Rather than running loss-leader sales to draw you in and then charging full price on everything else, OK Store keeps margins lean across the board. In practice, this means OK Store tends to run 10 to 20 percent cheaper than comparable supermarkets on the same items.
How the EDLP Model Works
Most Japanese supermarkets rely on a familiar rhythm: deep discounts on specific items each day, weekend “special” pricing, and point card multiplier events to pull in shoppers. OK Store opts out of all of this.
Instead, they compress costs at the operational level — leaner staffing, simpler store layouts, and less marketing spend — and pass that directly to the customer.
02 — Real Prices: What We Found on the Shelves
All prices below are member prices (tax-exclusive, tax-inclusive, and in USD for reference).
| Item | Excl. tax | Incl. tax | USD ~ |
| Kelp onigiri (昆布おにぎり) | ¥73 | ¥78 | $0.50 |
| Takoyaki, 8 pieces | ¥289 | ¥312 | $2.00 |
| Tonkatsu bento (member) | ¥509 | ¥550 | $3.50 |
| Ajinomoto Shumai, 9pc | ¥315 | ¥340 | $2.16 |
| Inaniwa udon, 5 servings | ¥250 | ¥270 | $1.72 |
| Sanuki udon, 5 servings | ¥184 | ¥198 | $1.27 |
| OK sparkling water, 500ml | ¥40 | ¥43 | $0.27 |
The Onigiri That Made Me Stop Making Lunch
Let me tell you about the item that genuinely changed my morning routine.
The tuna mayo onigiri. ¥69 before tax. That’s ¥74 with tax — roughly 47 cents.
For context: the same tuna mayo onigiri at a convenience store runs about ¥180. At a regular supermarket, you’re looking at ¥130 on a good day. OK Store’s version costs less than half of that.
But here’s what makes this personal. When I first stumbled across this onigiri three years ago, it was in the ¥40s. Forty-something yen for an onigiri. I stood there for a moment, genuinely convinced I’d misread the label.
My first instinct was the obvious one: something this cheap has to be cutting corners somewhere. So I bought one, took it home, and cut it in half — partly out of curiosity, partly out of suspicion.
The cross-section told a different story. The filling wasn’t a thin smear hiding behind a wall of rice. It was generous, properly distributed, the kind of ratio you’d expect from something that cost three times as much.
I used to make my own onigiri to bring to work. I don’t anymore. These days, two of these is breakfast — under a dollar, every morning, without complaint. If OK Store gave me nothing else, this onigiri alone would be enough to earn my loyalty.
All prices below are member prices (tax-exclusive, tax-inclusive, and in USD for reference).
Kelp onigiri at ¥73 (about 50 cents) and takoyaki 8-pack at ¥289 — both member prices.
The thick-cut roast tonkatsu bento — a genuinely filling lunch for under $3.50.
Two types of frozen udon, both priced well below most competitors.
OK’s own-brand strong sparkling water — 500ml for ¥40. Hard to beat anywhere in Japan.
Ajinomoto’s The Shumai, 9 pieces — the kind of freezer staple you’ll end up buying every week.
Member prices (OK Club card). USD based on ¥157/$ rate, May 2026.
03 — The OK Club Membership Card
To get the member prices above, you’ll need the OK Club card (オーケークラブ). It’s completely free, issued on the spot, and doesn’t require any ID. You can walk in for the first time and have it in your hand within five minutes.
With the card, you get a discount of 3/103 (roughly 2.9%) on all purchases made in cash or by QR code payment (PayPay, au Pay, d払い, etc.).
| Quick Note on PaymentOK Store does NOT accept major credit cards for the member discount — only cash and QR code payments.Credit card payment is accepted, but you won’t receive the 3/103 reduction.If you use PayPay or a similar app regularly, use that here. |
How to Sign Up (Takes About 3 Minutes)
- Pick up a membership application form at the customer service counter near the entrance.
- Fill in your name and contact details — no ID required, no proof of address needed.
- Hand it back to staff. They’ll issue your card immediately.
- At checkout, present your card and pay by cash or QR code to receive the discount.
| Tip for Non-Japanese SpeakersThe form is in Japanese, but it only asks for basic info: name, address, and phone number.Most staff are accustomed to helping customers fill it out. |
04 — What Actually Happened to My Grocery Bill
I was spending around ¥50,000 a month on groceries. After switching most of my shopping to OK Store, that number dropped to the low ¥40,000s — sometimes closer to ¥42,000 or ¥43,000.
That’s a reduction of roughly ¥7,000 to ¥10,000 per month. Annualized, that’s somewhere between ¥84,000 and ¥120,000 — real money, not hypothetical savings. And I didn’t change what I eat in any meaningful way.
The sparkling water alone was a revelation: I was paying ¥80–¥100 elsewhere for 500ml; at OK it’s ¥40. If you drink two bottles a day, that’s ¥2,000 saved per month on one item.
05 — What to Buy Here (and What to Skip)
Worth Buying Here
- Frozen goods (udon, gyoza, edamame)
- OK private label products
- National brand pantry staples
- Drinks (water, tea, juice)
- Dairy (milk, yogurt, cheese)
- Everyday proteins (eggs, tofu)
- Ready-made rice and bentos
Lower Priority
- Fresh fish (more limited selection)
- Premium produce (look elsewhere)
- Specialty or imported items
- Freshly prepared deli dishes
For fresh fish and higher-end produce, I’ll often supplement with a stop at a different store. But for the bulk of a weekly shop, OK Store covers everything.
06 — Before Your First Visit
| Practical Notes• Bring your own bags — OK Store charges for bags, as most Japanese supermarkets now do.• Use cash or QR code payment to get the OK Club discount. IC cards don’t qualify.• The store can get busy on weekend afternoons. Weekday mornings tend to be calmer.• Find your nearest branch at the official OK Store website (Japanese-only, but the map is easy).• Locations are Kanto-only: Tokyo, Kanagawa, Chiba, and Saitama. |
| A Note on EnglishOK Store doesn’t have English staff at most locations, and signage is Japanese-only.Google Translate’s camera feature covers most labels.Most checkouts are now semi-automated and easy to use without Japanese. |
07 — The Bottom Line
OK Store isn’t trying to impress you. It doesn’t have a sleek interior or a loyalty points scheme or a weekly flyer designed to make you feel like you’re getting a deal. What it has is something more useful: prices that are simply, reliably lower than everywhere else — every day, without exception.
I’ve been shopping here long enough that the savings have stopped feeling like a surprise and started feeling like a baseline. Which is, I suppose, exactly the point.
If you live in the Kanto region and haven’t been yet, go. Bring your own bag, pick up the OK Club card at the counter, pay by QR code — and then check your receipt on the way out. You might look at it more than once too.
| Quick Summary |
| → Everyday Low Price model — same prices daily, no flash sales |
| → 10–20% cheaper than comparable Tokyo supermarkets |
| → OK Club card: free, no ID required, issued on the spot |
| → Member discount: 3/103 off with cash or QR payment |
| → Best for: frozen goods, drinks, pantry staples, dairy |
| → Available in: Tokyo, Kanagawa, Chiba, Saitama |
Prices listed are member prices, tax-exclusive, as of May 2026. USD conversions use ¥157 per dollar. This article reflects personal experience and is not affiliated with OK Store.
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