I've got the BRP book, Classic Fantasy, Elric!, Cthulhu Invictus, and Cthulhu Dark Ages.
Among those I have a pretty nice collection of monsters to choose from to challenge my players (fantasty RP with some dungeon crawl and overland explorations) but I find myself looking for more.
What other publications should I look for to get more monsters for my game?
Malleus Monstrorum is for Call of Cthulhu but entirely compatible and very useful.
Originally Posted by southpaw
There is a creatures book being worked on for Magic World, and the later also has a good bestiary chapter, based on the old RQIII Creatures Book (which was/is available as the monograph Basic Creatures).
With a bit of work creatures statted for RQI/II/III or MRQ / MRQ2 / Legend / RQ6 should be useable with BRP.