You lucky rascal! That book looks to be in good shape, too!
I missed out on that book when it was still in print... Just kept putting off buying a copy, and then they were gone. I got a used copy off Abe Books about six years ago. Mine has a small water stain on the bottom corner of the back cover, but the book is not warped and is otherwise in good condition.
Anyway, your book is worth whatever you had to pay for it. Somebody needs to put out a good quality reprint. I think there are plenty of folks who would buy a new copy.
Notchy Bob