https://www.humblebundle.com/books An amazing deal and for good causes (and more to come). If you've never dipped your toe in the BF world you've no excuse not to now.
Dalek Empire is a treat. Two and three aren't as good but they are still fun to listen to. The Lost stories are definitely worth $15.
Pretty sweet deal for a good cause. Out of all of those, I've only purchased and listened to The Nightmare Fair, although none of them are ones I would be rushing to purchase in normal circumstances.
Going to assume you missed the thread I posted yesterday? http://www.trekbbs.com/showthread.php?t=261460