Humble Bundle's Hellboy Universe Megabundle continues from the previous two Hellboy bundles and includes them at discounted prices. $18 for the new items (+$20 if you add the two previous bundles).

Hellboy and the BPRD: 1952
Hellboy and the BPRD: 1953
Hellboy and the BPRD: 1954
Hellboy and the BPRD: 1955
Hellboy and the BPRD: 1956
Hellboy and the BPRD: 1957

Hellboy and the BPRD: The Beast of Vargu (own Beast of Vargu OS)
Hellboy and the BPRD: The Return of Effie Kolb (own 3 of 4 OSs)
Hellboy and the BPRD: The Secret of Chesbro House

Hellboy: The Bones of Giants (novel)
Hellboy: Odder Jobs (anthology) (own)
Hellboy: The Fire Wolves (novel)
Hellboy: The Ice Wolves (novel)
Hellboy: The Lost Army (novel)

Abe Sapien v1: The Drowning (own)
Abe Sapien v2: The Devil Does Not Jest
Abe Sapien v3: Dark and Terrible and the New Race of Man
Abe Sapien v4: The Shape of Things to Come
Abe Sapien v5: Sacred Places
Abe Sapien v6: A Darkness So Great
Abe Sapien v7: The Secret Fire
Abe Sapien v8: The Desolate Shore
Abe Sapien v9: Lost Lives

Lobster Johnson v1: The Iron Prometheus
Lobster Johnson v2: The Burning Hand
Lobster Johnson v3: Satan Smells a Rat
Lobster Johnson v4: Get the Lobster!
Lobster Johnson v5: The Pirate's Ghost and Metal Monsters of Midtown
Lobster Johnson v6: A Chain Forged in Life

Lobster Johnson: The Satan Factory (novel)

Crimson Lotus

It's a bundle I mostly don't have so worth buying.