>>561182Tip for you OP: Buy your kit AFTER you arrive at Svalbard: Its summer there now, and not so cold on arrival -- the Stores in Longyearbyen has a wide range of equipment suited for the local climate.
Since Svalbard is an unincorporated area, they have NO value added tax for inhabitants, meaning stuff is a lot cheaper for you there than in other stores.
tl;dr Buy shit at Svalbard.