Speaking of Necromancer Games, they had put out three volumes of good monsters in the 3.5e days called Tome of Horrors I-III. Well, now all three are being published in one super huge volume by Frog God Games, The Tome of Horrors Complete, in either Pathfinder or Swords & Wizardry formats!
The thing is huge, and is now preordering for $90. It’ll be over 1000 pages and have 750 or so monsters in it. And you get a PDF version along with of course. Get this, and never want more monsters again! At least in August, when it comes out.