By far, the best way to close a sale is by defining the need well. If you have defined the need and matched your solution to that need, you won’t have to close the sale further; it will close by itself. Even so, however, here are some tactical ways to close a deal:
Here, you assume that the deal is done. So, you might end by saying that you will deliver the products to the customer’s location.
Here, you ask a question that leaves only two options. For example: “Would you like to go with yellow or blue?”