I have been trying to buy the Wizards Forgotten Realms Sembia book series. there are seven books in the series. I can get the first three and the last three, but the 4th book, The Black Wolf by David Gross is OUT OF PRINT! AAAAHHHHHHHHHHHHHH!!!! The only place that I've found that I can get it is Amazon and the want $25 for a paperback book. WHat the heck happened to cause this? Please tell me oh gods of the Paizo company, this is making me crazy.
Same thing happened to me with the clan wars series of LotFR series from WotC. The Dragon(book 6 of 7) was damn near impossible to find and those that were available were 100 bucks. What I did was put it on my Amazon wish list and checked back periodically. E bay was a bust since it seemed that everyone else was looking for the same book (go figure). Eventually someone put the book up for standard price and I snatched it up. My advice would be to simply be patient and constantly check back (It sucks, but either that or you're going to pay the outrageous price).