A very fine omnibus set from White Wolf, with additional introductions by other authors, containing the 37 stories of 7 volumes (as listed above) recombined in 4 volumes:

1. Ill Met in Lankhmar (volumes 1 & 2)
2. Lean Times in Lankhmar (volumes 3 & 4)
3. Return to Lankhmar (volumes 5 & 6)
4. Farewell to Lankhmar (volume 7)
     

A partial omnibus set from the Science Fiction Book Club (SFBC), containing the first 33 stories of 6 volumes (as listed above) recombined in 2 volumes:

1. The Three of Swords (volumes 1, 2, 3)
2. Swords' Masters (volumes 4, 5, 6)
     

The above omnibus editions include Leiber's own introductory material from the seven individual volumes.

The Book of Fritz Leiber and The Second Book of Fritz Leiber are also combined in the omnibus volume The Book of Fritz Leiber, Volumes I & II.

Writers of the Dark is co-bylined H.P. Lovecraft because the book includes essays by Lovecraft.

As with other authors, sometimes paperback editions are not as complete as hardcover editions with the same title.

[Walpurgis Night. The Harz Mountains; the Country Around Schierke and Elend]

Peddling Witch.

Good sirs, do not pass by like that,
Or you might miss a pretty chance!
Spare me a more attentive glance,
My stock is well worth looking at.
  
There's nothing here to which an armful
Of earthly merchandise compares,
No single thing but has been harmful
To mortal man and his affairs.
  
There is no sword here has not tasted gore,
No cup from which into a healthy frame
Some searing venom did not pour,
No trinket here but that has brought to shame
Some lovely woman, nor a dagger but designed
To pierce a trusting ally from behind.

Mephistopheles.

You are behind the times, dear cousin;
What's done is done, what's past is trite;
Your stuff is fifteen to the dozen,
For only novelties excite.

Faust.

This entertainment gives me pause —
The strangest fair that ever was!

Mephistopheles.

Uphill now, all the surging crew;
You think you're pushing, but they're pushing you.
  

Johann Wolfgang von Goethe
"Walpurgis Night"
Faust, 4096-4117
translated by Walter Arndt