[thrifter]

In a similar vein, I developed a search engine for sales taxes in Canada (works for all provinces and territories). It was a much, much bigger undertaking than I initially thought, but here it is: http://isittaxed.ca/

I am considering open sourcing this project so that there could be a search engine like this for other countries.

[pandemic_region]

useful only in countries where the full price is not displayed upfront ?

[thrifter]

Correct. In Canada, you only see the retail price. The Canadian consumer still needs to know if the item is taxable and what tax(es) that might be. It's an issue for people on a tight budget.

I edited my first comment from "every" to "other". Thank you.