But jeez, Louise, don't send potential customers to Amazon or Barnes & Noble or any other discount retailer. Send them to your publisher!
First, your publisher has just spent, most likely, many tens of thousands of dollars creating your book and ancillaries. It's trying now to not only recoup that investment but also generate profit. Without that profit, you will no longer be a published author. At least of that book.
Mostly, though, you and the publisher are both losing money. Publishers give Amazon and similar distributors sometimes absurd discounts to have their book listed. The distributor then charges customers considerably more. No problem there, that's how they stay in business, and sales through these distributors can really help publishers make money.
So do everyone a favor. When you include a link to your book somewhere, use your publisher's product page address, and not Amazon's!