Just wanted to point this out.
https://www.humblebundle.com/books/create-comics-manga-quarto-books

Expires in 17 days.

At the $1 tier:
Cool Cars: Learn the art of Cartooning Step by Step, You Can Draw Manga Chibis, Drawing: Manga, How to Draw Magical, Monstrous & Mythological Creatures, How to Draw Vampires, Cartooning: Character Design, Cartoonist's Bible.

The $8 tier adds: How to Draw Cars Like a Pro, 2nd Edition, 1,000 Incredible Costume and Cosplay Ideas, Drawing in Black & White, How to Draw with a Ballpoint Pen, You Can Draw Manga Chibi Characters, Critters & Scenes, Fairies in Colored Pencil, How to Draw Zombies, Art of Drawing People.

And the $15 tier also gives you: Draw Like an Artist: 100 Faces and Figures, Drawing Comics Lab, Chibi Art Class, 100 Things Every Artist Should Know, Illustration Studio: Inking Florals, Dragons & Fantasy, Illustration Studio: Drawing Manga Heroines and Heroes, Drawing Perspective Methods for Artists, Figure Drawing Methods for Artists, You Can Draw Comic Book Characters.

I'll admit I'm not sure why a book on cosplay was thrown in.

--Sweetie Belle