I order watercolor supplies (art stuff...as in painting) from England from two companies in the UK...Bromley's and Jackson's. Both are stellar in terms of shipping, and for little more than many vendors in the USA gouge me for (a special pet peeve) I can depend on no more than 7 - 11 days start to finish. So it depends on the company, AND on what games USA customs wants to play with it.
It's an interesting and rich area.
One potential solution is for a person residing in a foreign country to make a purchase via a USA vendor. That way a very good prediction can be made for receipt date, if care is taken. Just a thought