Below is a listing with known, legit online dice shops that I have compiled and try to keep up to date as much as possible.
It has different tabs per region and shops are listed by country with added information on shipping costs (where available). Red flags indicate when there are known controversies or issues with a store to help make informed decisions about where to buy.
(Please note that there are different tabs at the bottom for the different regions.)
I also have a PDF version below, but it may not be as up to date as the Google sheet linked above.