Why Amazon Prime Big Deal Days is a Prime Opportunity for TV Advertisers

Another Prime Big Deal Days is right around the corner. The popular shopping event which coincides with the unofficial start of the holiday shopping season takes place on October 6 and 7 this year. And based on this past Summer’s Prime Day numbers, there’s tremendous opportunity for retailers. Prime Day drove an estimated $26.4 billion in U.S. online spending over four days, with Amazon's average daily order total running 120% higher during Prime Day than the year-to-date daily average. That kind of concentrated purchase intent creates something most media plans don't account for: a moment where the conversion environment is already working in your favor.

For brands that sell on Amazon, this matters more than it might seem.

The Number That Should Change How You Plan Prime Big Deal Days

Tatari analyzed TV advertising performance for 19 brands with sufficient Amazon sales data around five unique Prime Day and Big Deal Days events spanning 2024-2026. TV-attributed Amazon CPAs were approximately 21% to 54% lower during Prime Day and Big Deal Days than in the immediate post-event period.

The takeaway? When shoppers were already on Amazon ready to buy, TV worked harder.

That's not a small efficiency difference. A CPA that drops by half, even for a two-to-four-day window, matters for any brand with substantial Amazon volume.

How We Measured It

Tatari defines Amazon CPA as a modeled estimate of the incremental cost of acquiring an Amazon order that can be attributed to a specific TV ad. It’s calculated using Tatari's proprietary Amazon sales lift analysis, which estimates expected Amazon orders, measures incremental lift around TV airings, and attributes that response back to individual spots using a time-response profile.

The comparison was made against the days immediately following Prime Day, not the days before it. Pre-event behavior is messy: some shoppers deliberately delay purchases waiting for Prime Big Deal Days discounts, I mean who wouldn’t want 30-40% off a cherry-shaped toilet brush as a stocking stuffer this holiday? The post-event period provides a cleaner (pun intended) read on whether TV performed differently during the event window itself.

Amazon Shopping Events Consistently Moved the Needle

Across the four advertisers we measured, Prime Day/Big Deal Days were noticeably more efficient. Median modeled Amazon CPAs during Prime Day were 0.46x to 0.79x of post-event levels, meaning TV-attributed Amazon orders cost materially less during the event window than immediately after it.

The exact CPA levels varied by advertiser, which is expected. Categories, price points, Amazon maturity, and media plans all differ. The consistent direction is the more important finding.

Figure: Spot-level modeled Amazon CPA distributions for four illustrative anonymized advertisers, Prime Day/Big Deal Days vs. the immediate post-event Day period. Across this advertiser set, Prime Day/Big Deal Days CPAs shifted lower, indicating stronger Amazon efficiency during the event window.

The Real Story is About Attention

The obvious explanation is that TV simply got more attention during Amazon’s annual shopping events. The data suggests a more nuanced story.

Company-site response - Tatari's proxy for TV-generated attention outside of Amazon - was only about 5% higher during Prime Days. That's essentially flat. A 5% lift in general attention doesn't explain a 21–54% improvement in Amazon CPA.

A more data-backed explanation: Prime Day and Big Deal Days made Amazon itself a better conversion environment. Shoppers were already browsing, comparing, and ready to buy. TV didn't need to do all the work from scratch. It could help influence which brand or product a shopper chose to purchase once they were already in-market.

That's a meaningful distinction. TV's role during these shopping windows isn't to create intent, it's to capture it.

Five Things to Do Before Prime Big Deal Days

For brands where Amazon is a meaningful sales channel, Prime Big Deal Days should be part of the TV plan early, not handled as a retail calendar note after media has already been booked.

That means applying a few practical steps before the sales event:

1. Weight into the event, not around it. If budget is fixed, the cleanest move is shifting weight from the post-event period into the event itself. The efficiency data supports that trade-off.

2. Prepare the Amazon path before TV runs. Inventory, product detail pages, reviews, pricing, and Sponsored placements matter more when TV is sending demand into a high-intent marketplace. Don't let the downstream experience be the bottleneck.

3. Reduce friction in creative. "Available on Amazon" or similar language helps shoppers act without needing to search. When purchase intent is concentrated, removing steps matters.

4. Measure Prime Big Deal Days as a separate window. A standard weekly readout dilutes the event effect. Amazon shopping events need to be evaluated on its own, especially for brands with Amazon concentration.

5. Use the right comparison period. Post-event comparisons are cleaner for this analysis. Pre-event behavior can be misleading if shoppers are deliberately holding off for deals.

Now is the Prime Time to Plan

This analysis was limited to advertisers with usable Amazon sales data during the Prime Day/Big Deal Days window. It should not be read as a universal claim for every Amazon seller or every category. The CPA metric is also specific: it reflects modeled incremental Amazon orders attributed to TV, not total Amazon sales. 

Still, the implication is clear. When Amazon intent is already elevated, TV can become more efficient because it is meeting shoppers closer to the point of purchase.

For Amazon-focused brands, Prime Big Deal Days is not just a retail moment, it is a media planning opportunity. The brands that treat it that way are better positioned to capture demand when shoppers are already ready to buy.

To learn more about Tatari’s cross-channel measurement capabilities, let’s talk!

Frequently Asked Questions (FAQs)

Does TV advertising work during Amazon shopping events?

According to Tatari's analysis of brands with Amazon sales data, TV-attributed Amazon CPAs were 21% to 54% lower during Prime Day/Big Deal Days than in the immediate post-event period. This suggests TV performs more efficiently during these events because Amazon's concentrated purchase intent creates a stronger conversion environment.

Why is Prime Big Deal Days efficient for TV advertisers?

Tatari's data showed that general TV attention (measured via company-site response) was only about 5% higher during Prime shopping windows; not nearly enough to explain the CPA improvement. The more likely explanation is that Prime Day shoppers are already in-market on Amazon, so TV spend influences brand and product selection rather than needing to build purchase intent from scratch.

When is Amazon Prime Big Deal Days 2026?

Amazon has confirmed Prime Big Deals Day 2026 will take place from October 6-7, 2026.

What is TV-attributed Amazon CPA?

TV-attributed Amazon CPA is a modeled metric that estimates the incremental cost of acquiring an Amazon customer that can be attributed to a specific TV spot. Tatari calculates this using its proprietary Amazon sales lift methodology, which measures incremental order lift around TV airings and attributes that response back to individual TV ads.

Should every Amazon seller increase TV spend during Prime Big Deal Days?

Not necessarily. This analysis applies specifically to brands with meaningful existing Amazon sales volume. The opportunity is about shifting weight into the event window where appropriate, not universally increasing spend.