The prices for each item vary, and when you offer to sell anything, your total gold given or received goes down based on how much you purchase in the same transaction. They should have assorted items that you can choose to purchase from, and you can freely offer them anything in your inventory.
Whenever you enter a town, a castle, or one of the larger settlements in the game, you can visit the town’s trader to see what they have to offer. But there are ways to take further advantages of trading throughout the kingdoms in Bannerlord. You can bring that loot back to town, and if the trader has enough coin to satisfy your offer, you can walk away with some great money. Trading is an essential process in Mount and Blade II: Bannerlord. When you first start the game, it’s an excellent way for you to quickly earn money after attacking looters and taking everything they have them.