Funnily enough, I've had this happen in respect of a couple of books, although not yet in a TP novel. In both cases, I took them back to the bookshop at which I'd bought them and got a replacement. In one of these instances, I didn't even have the receipt to prove I'd bought it there (it was, as I recall, Julian Barnes' History of the World in 10 1/2 Chapters), but they still took it back without question (Waterstones, I love you). According to my daughter, who had a Saturday job at said Waterstones (although that came later and does not explain the good customer service), it happens pretty frequently and the faulty books are simply returned to the publishers. Sadly, I don't think that your situation is sufficiently unique to make your book in any way valuable.
By the way, I know it's pedantic, but your faulty book is not technically a misprint, but a mis-collation (if there is such a word). I am very hazy about the whole process of book production, but I believe mass market paperbacks are produced in sections, which are then collated and hot glued into the spine and cover of the book. In your case, they collated two identical sections (you probably got two section 2s, rather than section 2 and section 3).