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You are not picking one product. You are picking between forty.

By the end of the week you have to choose two or three to actually buy, which means holding all of them in your head at once and comparing them properly.

You look at a lot of products in a week. Most people compare them in a spreadsheet: copy the title, copy the price, type in your costs, paste the link, then do it again for the next one. It works, but it takes an evening. Sourcebook does the same job in a few clicks.

Getting it wrong is expensive. Say a product loses 43 cents on every sale. Order a hundred of them and you are $43 down before you sell a single one. Most people find out six weeks later, when the boxes turn up.

−$43.00

One hundred units of a product that loses 43¢ a sale. Four numbers and ten seconds would have caught it.

Spreadsheet, calculator, or Sourcebook

Saving a product

A spreadsheet
Copy and paste it yourself
Calculator extensions
Not saved at all
Sourcebook
One click

Comparing them side by side

A spreadsheet
Only if you build the formulas
Calculator extensions
One page at a time
Sourcebook
Sorted for you, best first

Whose numbers it uses

A spreadsheet
Yours
Calculator extensions
Its own estimates
Sourcebook
Yours, always

Time per product

A spreadsheet
About a minute
Calculator extensions
Seconds, then it is gone
Sourcebook
One click, and it stays

Where your data lives

A spreadsheet
Your computer
Calculator extensions
Usually their servers
Sourcebook
Your computer only

Price

A spreadsheet
$15 for a template
Calculator extensions
$20–40 a month
Sourcebook
Free

Stop keeping your product list in a spreadsheet.

Free, no sign-up, and it works on the sites you already buy from.