The channel nobody's running while Amazon auctions break
Amazon Sponsored Products CPC hit a 3-year high last week. Head-term bids for Prime Day are sitting between $2.50 and $8, and the event doesn't start until tomorrow. Every brand on the platform is bidding up the same inventory at the same time.
Meanwhile, Instacart Ads is delivering $5.25 ROAS on verified grocery purchases. CPCs run meaningfully below Amazon's rates. Competition for placements is low. And 90% of the $71 billion US retail media market never touches it.
That's not a niche edge case. It's a structural allocation problem.
What Instacart is actually working with
Fourteen million logged-in shoppers. Not estimated audience segments from device graphs or probabilistic matches — actual users whose purchase histories are tied to real grocery baskets. Instacart knows this person bought oat milk twice last month from Kroger and protein powder once from Costco. That's deterministic first-party data from completed transactions, not browsing behavior.
The $5.25 grocery ROAS benchmark compares favorably against Amazon Sponsored Products in CPG and grocery, where 3x–4x is typical at significantly higher CPCs. You're paying less for better audience data and getting stronger returns. The reason this doesn't land on more paid media roadmaps is the same reason most Instacart spend sits with enterprise CPG teams: it's filed under "trade marketing" and never finds its way to the performance channel conversation.
One more piece of the Instacart case worth understanding: a single buy reaches shoppers across multiple retailers. Walmart Connect reaches Walmart shoppers. Amazon DSP reaches Amazon shoppers. Instacart's network puts your placement in front of grocery buyers at Kroger, Albertsons, Costco, Wegmans, and H-E-B through one campaign. That cross-retailer reach isn't available anywhere else.
Why most brands aren't running it
Two things get in the way, and both are fixable.
First, Instacart lives in the wrong part of most org charts. The paid media team runs Google and Meta. The retail team negotiates co-op spend. Instacart Ads falls somewhere between them and usually ends up owned by nobody. The absence isn't a strategic decision — it's an oversight.
Second, your products need to be on the Instacart network before you can advertise. That means existing retail distribution, not just a Shopify store. DTC-only brands with no shelf presence at a grocery or mass retailer can't use Instacart Ads. But if you sell through Kroger, Costco, Albertsons, or any of the 1,400+ retailers integrated with Instacart, you almost certainly qualify and probably don't know it.
The categories that actually apply
Grocery. CPG. Supplements. Pet food. Beverages. Health and wellness. Baby. Cleaning and household products. Anything that moves through grocery or mass retail channels.
If your product sits on a shelf in a store that partners with Instacart, you have qualified inventory. If you sell software, apparel, or electronics, this channel isn't built for you — the audience and intent are grocery-specific, and the ROAS benchmarks don't transfer.
The targeting advantage goes beyond category relevance. Instacart can surface your protein bars to someone who bought a competing brand last Tuesday. That's a competitive substitution signal that Amazon's walled garden can't offer for Kroger-specific purchase data, and Walmart Connect can't offer for Costco data.
The Prime Day window
This week specifically, Amazon auction prices are punishing. Head-term CPCs are expected to spike $2.50–$8 across the next four days, with peak hours pushing higher. Every brand competing hardest right now is concentrating bids in the most expensive retail media inventory of the year.
Instacart's auction doesn't run a parallel event. Competition levels stay roughly constant regardless of what Amazon is doing. If you'd normally put 5–10% of retail media budget into prospecting or audience expansion on Amazon, redirecting that test budget to Instacart this week gives you a cleaner read on performance — outside the inflated Prime Day auction, against an audience with real verified purchase data.
Run a 4–6 week test, benchmark against your Amazon CPG ROAS, and check in-stock rates across Instacart-enabled retailers before launching. Poor availability kills Instacart ad performance the same way a broken product page kills Google Shopping ROAS.
If you want to see which of your ad channels are actually earning their budget, the free audit takes under three minutes.
Sources: RMIQ Instacart Ads Guide 2026, SellerApp, Quartile Prime Day Advertising Guide 2026, WPP Media 2026 Forecast, June 2026
