How to pick, source, price and sell a product, built from real product checks, not opinions. 18 pages, updated 6 October 2026.
Official tariff schedules are public, but they’re dense legal text. Search and marketplace data comes through paid data services most sellers never buy. We read both, for every product we check.
What sells, at what price, and who owns the page.
How many people search, and whether it is growing.
Who makes it, for how much, and whether they are real.
What it costs to get one unit to a customer.
Who your buyers watch, and what it costs to reach them.
Demand is the easy part. Every one of the 36 products in our 5 October 2026 US check had real search demand, yet none passed. A product has to pass four tests, in this order:
Real search volume in your country, steady or growing over 12 months. Not a feeling, not one viral video.
Page 1 has young listings from small sellers that sell every month, and no single brand owns the reviews.
Factory price, freight, duty, delivery, card fees and returns, with money left for marketing and a profit.
A factory price and box size that match the product people buy, not a carton, an accessory or a price per m².
Why 36 products with real demand failed. Crowded pages and costs beat demand every time.
Each of these gave us a wrong number at least once, before we built a check for it.
A “car seat” listed at 90 kg and 1.5 m³: the export carton, not the seat.
Compare the size with the top Amazon listing’s box.
“Car battery charger” came back at $5, $19.29 and $140 in three runs. The $140 one was industrial.
Ignore factory prices at or above the shelf price.
A $3 “Nuna stroller” listing, against a $411 stroller.
Ignore factory prices under 5% of the shelf price.
A “$60” pergola was $60–129 per m². About 11 m² makes it $660–1,430, against $508 on Amazon.
Read the unit next to the price: m², metre, kg, roll.
A 21.8 kg push mower in a 7.9 × 4.9 × 4.2 cm box.
More than 4 kg per litre is a misread size.
An 18 g portable breast pump in a 3.1 litre box.
Less than 20 g per litre is a misread weight.
“Nuna stroller” and “Thule roof rack”: page 1 belongs to one brand you can’t make.
If one word leads a third of page-1 titles, it’s a brand.
Run the four tests before you buy stock. A Launch Dossier runs them for 3 products in your market and budget, sets aside bad supplier data with the reason, and shows what would make a near-miss work.
Where to sell, the US, UK and Germany side by side, what one sale really costs with 2026 duty, marketing basics, the free toolkit and a real Launch Dossier result.
The full playbook (13 chapters, about 60 pages) comes with every Launch Dossier.
Send them the free intro.