I have a book that is in otherwise great shape, but some of the pages are wavy...there are no signs of water damage, staining, etc...I got these books from somebody else so I have no idea what happened to the book.  Would you consider this postable or not? 

Thanks for any insight!

I just checked and it is WLed, no other one paper or hardback in the system. 

I would say it's postable.

I have a couple of ones with wavy pages that I can't remember what happened to them and have not listed for the same reason. However, if it was WLed I would post it, wait for the member to accept and send them a PM explaining the wavy pages and let them decide how bad they want it. Might hold off future problems.

I was thinking of posting it and PMing them, thanks for reassuring me! 

There's wavy and then there's wavy.  If the pages are wavy throughout the book in a uniform manner, it's an aspect of the paper used to make the book and not due to exposure to any liquids.  Also, some publishers' binding technique leaves a waviness particularly noteable nearer the spine.  If that's the case then the book is completely postable.  However, if it's a spot isolated from other portions of the book, that's typically due to having come into contact with something.  Sometimes the pages' texture changes to different degrees in cases of water damage as well.  Water damage such as this doesn't need to have caused any discoloration of the paper to still constitute damage.  If your book fits these discriptions better, then the book is not postable.   

Thanks, James, that really helps a lot! 

More and more frequently, some waviness to pages is appearing as a by-product of cheaper paper being used for printing.  Liquid damage is unpostable, wavy pages are postable unless caused by liquid after the printing process.