Retailers have always sold shelf space.
Increasingly, they are selling attention everywhere else too.
Sam’s Club can now sell advertising on fuel-pump screens and through its in-club audio network. Its Scan & Go app can show ads while members are physically shopping. Instacart can extend digital campaigns onto the screens of its Caper smart carts inside grocery stores.
The obvious interpretation is that retailers have found more places to put ads.
The more important one is that the physical store is becoming part of the media stack.
A sign in a store is not new. The measurement layer is.
Retailers have used endcaps, sampling programs, signage and checkout displays for decades. What is changing is the infrastructure behind those placements.
Sam’s Club’s Member Access Platform, or MAP, says every interaction can be tied to a verified member identity, allowing the retailer to connect media exposure with purchases across channels. In April, the company expanded its in-club offering to include fuel-screen ads and in-club audio ads. Fuel-screen inventory is available across more than 500 Sam’s Club fuel stations.
That is different from putting a poster next to a product.
A traditional sign can influence a shopper. A retail-media system can increasingly attempt to identify the audience, determine when the impression occurred and connect it to what happened at checkout.
Once that infrastructure exists, the store stops being only a distribution channel. It becomes measurable media inventory.
The phone became an in-store screen first
Sam’s Club has been moving in this direction for several years.
In 2024, it began placing display ads inside Scan & Go, its mobile self-checkout feature. The company later said those placements produced an average 15.5% sales lift and a click-through rate 10 times higher than standard display placements, while reaching members who were incremental to other campaign tactics. Those figures are company-reported results, but they illustrate why the format matters to advertisers.
The customer is not browsing a general website when the ad appears. The customer is already in a store, already shopping and often already holding the device being used to complete the transaction.
That collapses the distance between advertising and purchase.
The cart is becoming an operating system
Instacart is taking the concept one step further with Caper Carts.
The company’s smart carts combine product recognition, loyalty features, spending information, coupons and checkout with digital screens. Instacart also sells advertising on those screens and promotes its Carrot Ads platform as a way for retailers to run campaigns across online storefronts, apps and the physical aisle from one advertising stack.
In 2025, Instacart opened Caper Cart advertising to its broader base of brand partners. This year, deployments have continued expanding through grocery partners including Weis Markets.
Operationally, that is more interesting than the screen itself.
The cart can know where the shopper is, what has already been placed in the basket and what the retailer knows through loyalty data. That creates the possibility of advertising that responds not simply to who the customer is, but to the state of the shopping trip.
In other words, the aisle can begin behaving more like a digital session.
Every useful surface creates a temptation
There is an obvious risk in this model.
If every moment of the shopping journey can be monetized, retailers will be tempted to monetize every moment.
That can become self-defeating.
A fuel pump is useful because a customer has several idle minutes. An in-store audio message may be useful because it reaches the shopper near a purchase decision. A cart recommendation may help because it can surface a relevant offer.
But relevance and saturation are not the same thing.
Retailers control environments that customers enter primarily to accomplish a task. The media layer works only as long as it does not make the underlying experience worse.
That means the important operating metrics should not stop at impressions, clicks and attributed sales. Retailers will also need to watch whether media creates friction, slows tasks, reduces trust or makes customers feel that every physical interaction has become an advertising opportunity.
Retail media is becoming an infrastructure decision
The most interesting part of this shift is not the growth of another advertising format.
It is the convergence of store systems, identity, loyalty, checkout and media.
Historically, those functions were managed separately. Store operations optimized the physical environment. Marketing ran campaigns. Loyalty teams managed customer data. Advertising networks sold inventory.
Now those systems increasingly depend on one another.
A retailer that wants to turn a physical store into a measurable media environment needs more than screens. It needs identity resolution, inventory awareness, transaction data, consent controls, attribution, campaign management and enough integration across the stack to make the experience work in real time.
That makes retail media an operating-model question as much as an advertising one.
The store was always valuable because purchase happened there
Digital advertising spent years trying to get closer to the transaction.
Retailers are starting from the opposite position.
They already own the transaction.
What they are building now is the media infrastructure around it.
That is why fuel pumps, smart carts, mobile checkout and in-store audio matter more than they might appear to individually. Each is another point at which a retailer can connect attention to identity and, eventually, to a purchase.
The store is not becoming digital because screens are appearing in the aisles.
It is becoming digital because the systems behind those screens increasingly understand what happens before, during and after the impression.
That is what turns a store into a media channel.