Depending on your interest in ships, there are various publishers catering to the various interests.
Shipyard, from Poland, does ships from the Golden Age of Sail.
America based reseller
https://www.agesofsail.com/ecommerce...er-models.html
JSC, from Poland, publishes various military and civilian vessels
JSC (International webstore)
GPM, from Poland, publishes both civilian and military ships.
GPM • modele kartonowe
HMV, from Germany, has a large range of military and civil kits
https://www.h-m-v.de/en/
Wilhelmshaven, from Germany, also has civil and military subjects, including the carriers Forrestal and Nimitz
Papermodels, Cardmodels, Wilhelmshavener Modellbaubogen, Bastelbogen, Kartonmodellbau, Kartonmodelle, Architektur, Schiffe, Flugzeuge
And undoubtedly there will be other sites mentioned, but these are some of the biggest ones, and have quite the selection.