I don't think there is a Borders-wide policy. I think Borders is suffering from disinformation and Democratic/liberal employee activists.
Expect a formal statement disavowing the statements of employees implying Borders is refusing to sell the book to be made next week if this continues and gets press coverage.
My brother and I have been calling our local Borders each day asking about the book.
The clerks in my town have been saying the book is on back order and they should have some in the store next week. We'll see if they get a shipment or if they are just covering for not carrying it.
Yesterday they tried to get me to order it and have it shipped to me.