We have been used book sellers on Amazon for roughly 20 years. Suddenly we need to get permission from publishers along with receipts showing we bought numerous copies of one title. This is lunacy and clearly a move by big business to make used copies less available from small businesses. I am sure they give a big discount to Amazon for cooperating. Its such a shame. Amazon started out being an umbrella for small business. That's what was so neat about it in the beginning. I could buy a book from a small seller or even just an individual and converse with them about the history of the book, etc. It was great! Selling today is nothing like what it used to be and I am so sad because I am not just a book seller, I'm also a bibliophile who loves everything about what I do. I fear the joy of it is lost in the Amazon.