What Major retail store Barnes and Noble?

Yes, they buy books wholesale to sell retail.

Yes, Barnes & Noble does buy books - it's called the Guaranteed Buy Back. If you purchased a book from them with the Buy Back stamp and you have the original receipt, they will buy it back for the Guaranteed Buy Back amount (which is listed under the price on the book).

Barnes & Noble will also buy used textbooks that are in good condition. A price quote is based on future demand for the book and current stock availability.