The General Store
When visiting the Trade District you will find the General Store, here is a typical inventory for sale.
The first 5 items will always be the same, Glass Flask, Iron Lamp, Wood Hang Glider, Wood Boat and a Pet Food.
The Iron Lamp can vary in quality (green, blue etc) and the Pet Food will vary as well.
The rest of the inventory will always be different, even the bombs may vary.
You can find Formulas for every type of Armour, Weapon and Jewelry, and in all qualities (green, blue etc).