Almost each settlement in the Awplanet world has one or several stores, where the most different goods – armors and weapons, electronic devices, books, drugs and other things can be purchased. Most stores are specialized on some certain category of goods. Some items (e.g. picks, medicine kits, fishing nets) cannot be created; you can only buy them in a store.
You may also sell your goods there. Take into account, that in most cases the purchasing prices in the stores are extremely low; in addition, a merchant may refuse to buy your goods if he already has sufficient amount of it.
To use store-service, talk to a merchant. A trade-window will open and you’ll be able to buy goods or sell your property.