Cart vs Car

Cart, not car.

Know before you go.

Pampers at Target vs the Mama Bear we buy — same job, not the same box.

$2,548a year back · 15 exact packs, 17 swaps
What we buy
Mama Bear Gentle Touch Diapers, Hypoallergenic,…
+ Time
$66–$69
Pampers
$63.38
Mama
$36.72
About $26.66 less than Pampers, for this many diapers.$639.84/yr
Per diaper · 34¢ → 20¢Open this pack →

Item savings first. Amazon prices are entered by you until the live feed is approved. 30 store prices recorded. + Time is the hour (if you went to the store just for this) — never added to the pack winner.

Featured pack: Mama Bear Gentle Touch Diapers, Hypoallergenic, Size 2, White, 184 Count (4 packs of 46)

Browse by aisle

Already on the shelf

Start with a store price we already recorded.

Publix and Target first. Diapers and wipes stay at the top — including the Amazon brands we actually buy, next to the name-brand shelf. Same job, not the same box.

See all staples
Opportunity cost

The shelf is the item. The hour is what you give up.

If you drive weekly for a few things you could order, that is not a $2 difference on the box. It is 30–60 min + $0.66 gas — about $8–$16 a run — every week. That is $424–$814/yr in time and gas before you buy anything.

Split across 3 packs, this box carries $3–$5. On a 184-diaper pack that is +1.5–2.8¢ per diaper — on top of the shelf price. Never added to the prices above.

Weekly habit
$424–$814/yr
This pack’s share
$3–$5
Per diaper
+1.5–2.8¢

if this was one of 3 things you drove for. Change your wage, drive, and basket in Your time.

How it works

1

We record the shelf price — Same brand, size, and count, from real receipts.

2

You type today’s Amazon price — We already have the store number when we recorded it. Per-unit shows as soon as both prices are in.

3

You see the difference — Before you get in the car. When the store wins, we say so.

Item savings first — we never add gas or time to make Amazon look cheaper. The hour is the opportunity cost, shown per unit on its own line.

Our stories

We started this the month our daughter was born.

Week three, one of us drove to a third store at 9pm for Size 1 diapers — and paid $4 more than Amazon was charging that same night. So we started keeping receipts. Then a spreadsheet. Then friends with newborns started asking for the spreadsheet.

This site is that spreadsheet, cleaned up. We only list things we actually buy, every store price is dated, and when the store wins, we say so. Amazon prices stay shopper-entered until the live feed is approved.

— the two of us, one toddler, one catRead our stories →
The original receipt
Pampers Size 1 · store$28.99
Same box · Amazon that night$24.63
Per diaper30¢ → 26¢
Gas + 52 minutes$1.45
Kept in our pocket$5.81
Have a receipt in hand?

Check any price in 10 seconds.

Item savings first. Amazon prices are entered by you until the live feed is approved. Per-unit shows when you know the count.

Subscribe & Save discount shown
Enter both prices to see who wins.

Item prices only · 12 deliveries/year · no coupon, card reward, tax, or trip padding. Use the exact recurring total instead →

Amazon shows a final recurring total? Use the exact-price calculator
Your prices

Use today’s exact-pack totals

Before tax. Do not include a one-time coupon or card reward.

Exact product and pack nameOptional for the math. Add it to search Amazon and save this comparison on your device.
Your store
Publix shelf price
$
Amazon one-time price
$
How Amazon shows the Subscribe & Save offer
The final recurring total is the most direct input. Use percentage mode only when Amazon does not show that total.
Amazon Subscribe & Save price
$
Enter the recurring item total shown before tax, without a one-time coupon or card reward.
Units in this packWipes, diapers, ounces, pounds, rolls — so we can show the save per unit, not just the pack total.
How often you would receive it
Your answer will appear here

Two prices. One honest ladder.

Enter the shelf, Amazon one-time, and final Subscribe & Save prices—or switch to discount mode. We then show the item-price difference per order and per year.

Store shelf—
Amazon one-time—
Subscribe & Save—
How to use Subscribe & Save without overbuying
If Amazon wins

Use the savings without creating a stockpile

A lower Subscribe & Save total is a decision signal, not a future-price guarantee. Use four checks before making the order recurring.

  1. Match the exact pack

    Confirm the brand, product form, flavor or scent, size, and count. Then check the seller and current delivered total on Amazon.

  2. Read the recurring line

    Choose Subscribe & Save only when Amazon offers it and the displayed recurring total still beats the store. Keep a first-order coupon or card reward out of the recurring baseline.

  3. Use your real burn rate

    Estimate how long one pack actually lasts and choose an interval at least that long. A faster cadence can turn a price win into an overstock problem.

  4. Audit the next delivery

    Compare Amazon’s upcoming-delivery price with the store again. Skip, change the cadence, or cancel when the price or your household need no longer fits.

Cart vs Car can calculate the break-even; only Amazon can show current eligibility, price, and subscription controls. Read Amazon’s Subscribe & Save explainer