I realized when I bought "The Catcher In The Rye" in digital form that I can only buy it once. But I want to buy more copies of "The Catcher In The Rye", Ev

I realized when I bought "The Catcher In The Rye" in digital form that I can only buy it once. But I want to buy more copies of "The Catcher In The Rye", Every time I visit Amazon.com I try to buy "The Catcher In The Rye" but it won't let me because I already own "The Catcher In The Rye" and that's a real shame because I really like "The Catcher In The Rye" and want to buy more copies of "The Catcher In The Rye" whenever I see a copy of "The Catcher In The Rye" which I cannot do in digital form.