What's the best domain strategy for international SEO?

[ZS2]

Hi All,

A newby here needs help, please!

My store is under development with my primary market being UK with a dot COM domain.  I want to have just one main domain.

I do not want separate country  ccTLD due to cost and inconvenience. The choice appears to be subdomains or sub-folders.  I hear sub-folders are best for SEO.   Content will be identical for each market. Prices will be at different levels, but in local currency.  Prices will be all-inclusive, i.e. including shipping and duty/tax. What is the best  domain strategy to help International SEO?    Thanking you in anticipation.