There are services in the US that accept shipments and forward them to Europe, e. g. https://www.shipito.com/
Never used this service or a similar one myself, but should work. Similar services exist near borders to countries with different taxation, as one can semi-legally* avoid some taxes that way.
*Not legal advice; use this at your own risk.
If there’s a helpful US or Canadian resident here, he or she might also help a fellow Conanian. hint, hint
P. S.:
The artist has a web page and lots of great work at https://www.inprnt.com/search/products?q=Francesca+Baerald. The Hyborean map isn’t included, but if you e-mail her, maybe that can be remedied. The method mentioned above seems cheaper, though.