Britain's biggest department store will be the first retailer outside the United States to sell the bookstore chain's e-reader, selling the devices at each of its 37 stores. The Nook has emerged as the main rival to Amazon’s Kindle range in the United States. The cheapest model costs $99, or around £63. The cheapest Kindle costs $79 in America, but carries advertising. In Britain the cheapest Kindle is £89 but advertising-free. Barnes & Noble has not revealed pricing for its British launch.