When Mary Porter walked into Manhattan's newest Aldi store hunting for bargains, the long-time resident found what she considered a retail miracle in plain sight: a $4 jar of almond butter that costs $22 in her own neighbourhood.
"Aldi has the reputation for being inexpensive, so I thought I would come and check it out, and by golly, it is amazing," Porter, 79, told the BBC, marvelling at the savings alongside the fresh spinach and organic raspberries filling her basket.
To the unassuming passer-by, the storefront is completely hidden, tucked away in an underground car park beneath The Ellery, a luxury apartment complex where the cheapest rent starts at nearly $5,000 a month. In fact, the building's own website omits the grocer from its curated neighbourhood guide, choosing instead to highlight pricier options like Whole Foods and Brooklyn Fare.
Step past the luxury façade into the basement, and the quiet disappears. Even on an early Tuesday afternoon in July, the brightly lit, bustling space hums with high energy as a lunchtime crowd of New Yorkers navigates the narrow aisles with oversized canvas bags.
Porter's discovery is part of Aldi's $9bn US expansion plan to add 800 new stores over five years, specifically targeting dense urban hubs like Manhattan. It marks a massive scale-up for the German supermarket, which first entered the US in 1976 and has grown its footprint to nearly 2,800 storefronts.
The aggressive real estate blitz signals a bold shift for a brand traditionally associated with suburban strip malls and lower-end consumers.
Incumbent US grocers may look with concern at the insurgency Aldi pulled off in the UK market in the 1990s. Alongside fellow German supermarket Lidl, Aldi captured market share by offering cheaper prices for high-quality goods. Today, Aldi is the UK's fourth biggest grocer, commanding 10.8% of the market.
Its rapid growth is mirrored across Europe, aided by easing perceptions of it as a strictly lower-cost grocer as shoppers became impressed by product quality. The cost-of-living crisis further fueled its ascent.
However, while Aldi is ascending the ranks of American grocery consciousness, it is not, and may never aim to be, Walmart. Aldi holds just 2.9% of the US grocery market, while Walmart controls about 20%.
Yet analysts say staying smaller is precisely how Aldi wins. Data from Placer.ai reveals Aldi is capturing middle- and higher-income shoppers with household incomes between $75,000 and $125,000.
"Those shoppers have started to trade off a visit to a conventional grocery store or a quick service restaurant and started to go into Aldi more frequently," said RJ Hottovy, head of analytical research at Placer.ai. "They're looking for ways to stretch their household budget."
Winning over city dwellers accustomed to premium brands remains an uphill battle. First-time visitor Ralph Montenegro praised the prices on staples like flour and fruit but noted he still prefers Trader Joe's. He added that Aldi's reliance on packaged, private-label processed foods was a detractor compared to organic options.
This strict reliance on limited private labels is exactly what keeps Aldi's overheads low, according to Dustin York, an associate professor at Maryville University. He says Aldi targets a lean, highly efficient model that provides 80% of what a traditional big-box retailer carries, but at a much lower cost.
Still, York argues it is unlikely Aldi will take significant market share from Walmart. "I call Walmart the battleship, and I call Aldi a submarine."
Navigating crowded Manhattan streets brings distinct challenges. "Their biggest kryptonite is real estate cost," York warned, pointing to average asking rents between $350 and $700 per square foot.
On Bloomberg's Odd Lots podcast, Aldi's US chief commercial officer Scott Patton detailed that supplying the Manhattan store requires trucking inventory from South Windsor, Connecticut, using shorter, specialised trucks to navigate tight streets. "We come at night because of the congestion," Patton said, noting each truck requires a two-driver team. To keep shelves stocked, Aldi runs three to four of these trips every night, calling it a "logistical symphony."
Because of these structural constraints, beating America's largest retailer is nearly impossible, says Jerry Sheldon, a retail analyst at IHL Group. "The reason Aldi cannot simply out-discount its way to the throne is that Walmart fights with a war chest and Aldi fights with a scalpel."
For shoppers like Mary Porter, the corporate chess match matters less than the immediate relief to her wallet. "I get on the subway with my big bag and go home with my cheap groceries. I mean, I'm so happy. This is amazing," Porter said.