Chest Shops
We use QuickShop for our chest shops. You can find some info about the plugin here.
Creating Shops
Place down a Trapped Chest anywhere and use /qs create <price>
to create a shop with the item you're holding at a given price. You can click the sign on the chest to access a chat-based menu, allowing you to alter settings on your shop. Put items in the Trapped Chest to stock your shop.
Finding Shops
Use the /shopexplorer command to find shops anywhere in the server! This menu should be fairly intuitive to use.