Tool & guide

Choose what to buy with a purchase comparison checklist

A $29 lamp that needs a $9 bulb and $5 delivery costs $43. A $42 lamp with free delivery is cheaper, and it stays cheaper even with a 15% restocking fee if you send it back. Put up to four options in and the page totals what you would pay, and what you would lose if you returned it. Nothing is ordered from this page.

Read the guide ↓

The calculator

Your options

Type in what each listing says. Leave a cost at 0 only if you have checked that it really is 0. If the listing hasn’t told you something you need (the base width, say) set “fits” to unknown and the page will keep reminding you. The example is three desk lamps.

Cheapest delivered: Lamp B (marketplace seller) at $42.00

OptionHeadlineDelivered totalLost if you return itCost per warranty monthFits
Lamp A (retailer site)$35.00$43.00 (+$8.00 extras)$14.00 within 30 days$1.79yes
Lamp B (marketplace seller)cheapest delivered$42.00$42.00$6.30 within 14 days$3.50unknown
Lamp C (needs a bulb)$29.00$43.00 (+$14.00 extras)$14.00 within 60 days$3.58yes

Lamp C (needs a bulb) looks cheapest ($29.00) but costs $43.00 delivered, $1.00 more than Lamp B (marketplace seller).

If it turns out wrong, Lamp B (marketplace seller) costs you least to send back ($6.30).

The cheapest option still has an unknown. Lamp A (retailer site) is the cheapest that is confirmed to fit, at $43.00; confirm Lamp B (marketplace seller) first if the saving matters.

Saved in this browser only; nothing is sent anywhere and nothing is ordered. It only counts money: not the time spent messaging a seller, and not that you might just want the nicer lamp.

Read the delivered total first

The three desk lamps from the calculator
OptionHeadlineDeliveredLost if returnedWarranty
Lamp A, retailer$35$43$14 (delivery + $6 return shipping)24 months
Lamp B, marketplace$42$42$6.30 (15% restocking)12 months
Lamp C, needs a bulb$29$43$14 (delivery + $9 bulb)12 months

Unknown is not the same as zero

If checkout hasn’t shown you tax or delivery yet, the total is unknown. An unknown can’t be the cheapest option. We made the “fits” field work the same way: an option whose base width is missing from the listing isn’t ready to buy, however cheap. The verdict names what to confirm first. The fields people leave at 0 by accident are return shipping and the restocking fee, because listings don’t show them.

Things the page does not count

Time. Messaging a seller about a width costs an evening, and the calculator gives it no price. It also can’t tell that you simply want the nicer lamp, which is a fine reason to pay $1 more. What it can do is stop a $29 headline price from winning when there is a bulb you have to buy separately. Recheck the price and the final total on the payment page. The return window usually runs from the delivery date, but some sellers count from dispatch, so read the returns page before you order. If your currency isn’t dollars, change the symbol at the top.

Sources

  • FTC: Online Shopping

    Its one addition to this page is the advice to pay by credit card, because you can dispute a card payment.

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