The first focal point is that a sales oriented environment can be a place of energy but it has to start with the staff. You can say that you are energetic and you look forward to working with a fun team.
The second focal point is that you need to express your energy toward the product you will be promoting. In other words, you've got to feel good about the product that is offered by the retailer. Even if its many products, make sure you research the company background so you can add that you trust the product and the company ethics.