Civilization thrives on trade.

Nostrum coinage is accepted legal tender across the world, and so prices are listed in pence.

Markets

Every major city has its own market, which are variants of this one. They might have equipment not otherwise for sale, or just some things are more expensive than others.

Luten-Augusburg

Luten-Augusburg has two major guilds that control everything made in the city: the Blacksmiths' Guild, and the Tailors' Guild. If your character is on the wrong side of one of these guilds, then it costs twice as much to buy their goods in the city.

Luten-Augusburg, like Redwine, sells armor made out of treated wood. Treated wood is as inflexible as iron, but under sufficient force still shatters like wood.

Services

Luten-Augusburg is overflowing with people of a violent nature. It's 20% cheaper to hire a mercenary.
Luten-Augusburg has two hospitals and is one of the headquarters for the Church of Serene. It's 40% cheaper to purchase medical services.

White Harbor

The capital of Westfal, it is a large city on the cost of the channel separating Nostrum and Westfal.

Gear

Crossbows are 20% cheaper in White Harbor.
Iron and steel products are 10% cheaper in White Harbor.

Illicit Goods

Soldier's Chocolate is 50% cheaper in White Harbor.

Equipment

Equipment is what a character can carry on their person. Swords, tools, poisons, whatever: if it can be stored in a backpack or fit in a hand, it's equipment.