Articles and guides
We write about what we read in our own data: the gap between chains, how products are matched by barcode, how to read a product page.
How to read a Cá Buồm product page
What the badges «3 shops», «save 12%» and «−25%» mean, how the «Where it is cheapest» table is ordered, how to read the price history and why you should still click through to the shop before paying.
Same barcode, three prices: which Vietnamese supermarket is cheaper
Cá Buồm matches groceries from Co.opmart, WinMart and Kingfoodmart by barcode. On 15 Sep 2026, 7 out of 10 products sold by two or more chains differed by 5% or more, and the cheapest chain is not the one you would guess.
Where laptops are cheaper: GearVN, Phong Vũ or MemoryZone
How much the same laptop, monitor or headset differs across three big Vietnamese electronics shops. Cá Buồm data for 15 Sep 2026: 4% on average, up to 60%, and no shop is cheapest every time.
The SJC gold premium: the number actually worth watching
How much SJC gold costs above the converted world price, how the premium per tael is calculated, why the gap exists, and what it tells a buyer.
Vietnam fuel prices: why zone 1 and zone 2 differ on the same day
How to read the Petrolimex retail fuel board: zone 1 and zone 2, the fortnightly adjustment, and the products E5 RON 92, E10 RON 95, diesel and kerosene.
