The Book Depository review: purchasing a book

I am trying to buy a copy of Mein Kampf. I reside in The United States of America in California and my transaction will not go through from your end, I've called my bank provider and every thing from my end is good, I don't know why the Book Depository keeps declining my purchase. I've tried this purchase multiple times and it still doesn't seem to be working. Please help me sort this out, Thank You.