Work in pairs. Take turns talking about the products you can buy in the following places. Ask questions like: What can you buy in a bookstore? Have you ever bought anything in a bookstore? After that, in your notebook write a list of the things you can buy in those places. You can use this list to check the product you will buy or sell in your conversation.
but you must put what product you are going to want to buy and we will do it for you