I notice that wish-listed books with ISBN's are requested immediately, while those without those pesky numbers sit unclaimed.  I posted seven books by Heyer and the three without numbers have not been asked for although there are dozens of requests for them showing on the Club Wishlist.  For example, there are two copies of Devil's Cub available, so if you have any Heyer's on your list CHECK the posted books list.  I check the posted books every week for books on my wishlist and have twice found a copy that didn't have an ISBN and had never been offered to me.