Fritz Leiber's Swords and Deviltry is $1.99 at Amazon. Swords and Deviltry is the first collection of Fafhrd and Gray Mouser stories.
Leiber was a pulp master and Fafhrd and the Gray Mouser should be more widely known. Unlike their pulp brother, Conan, they were human and had failings. The stories usually had a dash of humor to them.
I will say this first collection starts slow. I remember not caring much for the individual stories The Snow Women or The Unholy Grail. The book really takes off when the characters meet in Ill Met in Lankhmar.