Consumer Council’s latest supermarket pricing study uncovers hidden markups before buy-one-get-one-free promotions, reveals larger packages can cost more per unit, and identifies the cheapest day to shop at major chains.
Hong Kong’s Consumer Council has delivered a sobering reality check for the city’s online grocery shoppers: those eye-catching discount labels plastered across digital supermarket shelves may not represent the genuine savings they appear to offer. The watchdog’s newly released pricing investigation, which tracked e-commerce data from ParknShop, Wellcome, and AEON over a 47-week period, found that some retailers quietly inflate single-item prices by as much as 50 percent before launching multi-buy promotions—leaving consumers paying the equivalent of, or sometimes more than, the regular shelf price once the supposed discount is calculated.
Buy-One-Get-One-Free: A Closer Look Behind the Fine Print
The investigation uncovered a concerning pattern across Hong Kong’s biggest grocery chains. Products advertised with enticing offers such as “buy one get one free,” “choose any 2, get 1 free,” or “add $1 for an extra item” frequently saw their marked single-unit prices elevated just before the promotion period began. The result? Shoppers believed they were securing half-price deals when the effective per-item cost barely differed from everyday pricing.
A particularly stark example involves Amoy small-grain sesame oil (150ml) at ParknShop. During non-promotional periods, the product typically retailed between $10 and $14. Yet when the “buy one get one free” banner went up, the stated single-unit price jumped to $20 or even $22. After factoring in the free item, each bottle effectively cost between $10 and $11—offering a maximum real discount of only 29 percent, and in some instances actually exceeding the regular walk-in price.
Similarly, Lee Kum Kee steamed fish soy sauce (410ml) was listed at $21.9 per bottle during a buy-one-get-one-free event at ParknShop, bringing the per-unit cost to $10.95. Once the promotion concluded, the standard price reverted to $13—meaning the true saving was a modest 16 percent, nowhere near the implied 50 percent discount shoppers thought they were receiving.
Wellcome employed comparable tactics. Superlegit silver noodle family packs (4 sheets) were marked at $20 per pack during a “choose any 2, get 1 free” campaign, translating to $10 per pack. However, during regular non-promotional periods, the same product was routinely priced between $10 and $14. Measured against the lowest everyday price, the actual discount during the promotion ranged from zero to just 29 percent.
The Bigger Package Fallacy: When Size Doesn’t Equal Savings
The Consumer Council’s pricing analysis, standardized to per-100-gram or per-100-milliliter unit costs, also dismantled a common shopping assumption: that larger packages inherently deliver better value. In several instances, the opposite proved true.
Take carbonated beverages at Wellcome and AEON. Two-liter bottles of Coca-Cola ranged from $15 to $19.9, working out to $0.75–$1 per 100ml. Meanwhile, 1.25-liter bottles priced between $8.5 and $11.9 translated to a more economical $0.68–$0.95 per 100ml. At the most extreme comparison, the larger format cost a staggering 32 percent more per unit than its smaller counterpart.
Evaporated milk told a similar story across all three supermarket chains. Nestlé Carnation full-cream evaporated milk in the 405g can was priced between $13.9 and $19.9, equating to roughly $3.43–$4.91 per 100g. The 150g version, costing $5–$6.5, reduced the per-100g price to $3.33–$4.33. When the large can carried a $16.5 price tag alongside a $5 small-can promotional price, the bigger package’s unit cost exceeded the smaller one by 22.2 percent—demonstrating that deep discounts on smaller formats can easily flip the value equation.
Timing the Market: Which Day Offers the Best Prices?
After scrutinizing price fluctuations across 222 sample products throughout the week, the Consumer Council identified distinct best-buy patterns for each retailer:
AEON: Wednesday emerged as the strongest day for single-item pricing, with approximately 39 percent of sampled goods hitting their weekly lows. For multi-buy promotions, Friday and Saturday offered the most attractive rates (39 and 41 percent of items at their cheapest, respectively). Thursday, conversely, logged the highest number of items at peak prices.
ParknShop: Thursday proved optimal for individual purchases, again with 39 percent of products at their lowest single-unit cost. Multi-buy deals were best spread across Wednesday, Saturday, and Sunday, when 39–41 percent of goods reached their best effective prices. Friday stood out as the day with the most expensive price tags.
Wellcome: Saturday was the prime shopping day for single items, with 35 percent of samples at weekly lows. Weekend multi-buy promotions delivered exceptional value—50 and 51 percent of products on Saturday and Sunday respectively hit their cheapest combined rates. Like its competitors, Wellcome recorded its highest single-item prices on Friday.
Practical Tools for Smarter Shopping
To help consumers navigate these pricing complexities, the Consumer Council has upgraded its “Price Watch OPW” mobile application, featuring five key functions designed for real-time price comparison:
- Hot picks and price drops: Instant access to products with significant price variations across retailers, recent discount leaders, and seasonally popular items.
- Smart basket calculator: Build a personalized shopping list and let the app determine which supermarket offers the lowest total cost for purchasing everything in one trip.
- Unit price analysis: Track 30-day price trends with automatic conversion to per-100g or per-100ml unit costs for genuine value comparison.
- Scan-and-compare: Use the in-store barcode scanner to instantly retrieve current and historical prices for thousands of products across major chains.
- Target-price alerts: Set desired price thresholds for favorite items and receive automatic notifications when prices drop to the preset level.
The Bottom Line
The Consumer Council’s findings serve as a valuable reminder for Hong Kong shoppers to look beyond flashy promotional labels. Comparing unit prices, checking historical price trends, and choosing the right shopping day can yield meaningful savings. With the OPW app now offering comprehensive price-tracking tools, consumers are better equipped than ever to identify genuine bargains—and sidestep the carefully constructed illusion of a discount. As online grocery shopping continues its rapid expansion across the city, informed decision-making remains the shopper’s most powerful defense against cleverly disguised price hikes.