Coming in the Forsaken Shores update, and new to the Sea of Thieves, are Sea Posts.
Sea Posts are mini-outposts with one trader. Think of them like a bargain store: they’ll carry a handful of random cosmetic items that the major outposts stock, but will sell to you at a discount!
Additionally, the new merchant quests, Cargo Runs, may start or end at sea posts.
There are a couple of sea posts in each region, including Devil’s Roar, so from September 19th remember to keep a close eye out for these isolates trading posts when you’re sailing the seas. You never know what bargains you might find!