Humble Bundle has partnered with Kodansha to release a bundle of isekai series. You'll get a bunch of DRM-free digital volumes of manga based on a tier system. Humble Bundle also recently changed their interface. The buttons under "Bundle Filters" show what you get based on how much you pay. There's a dropdown labeled "Adjust Donation" to change the split on where your money goes, as some of it goes to charity.

Here's the maximum of what you can get:
Shangri-La Frontier vol 1
Goodbye! I'm Being Reincarnated! vols 1-3
The Invincible Reincarnated Ponkotsu vols 1-3
I Guess I Became the Mother of the Great Demon King's 10 Children in Another World vols 1-2
Alicia's Diet Quest vols 1-2
Clockwork Planet vols 1-10
Otherworldly Munchkin: Let's Speedrun the Dungeon with Only 1 HP! vols 1-2
The Great Cleric vols 1-2
My Unique Skill Makes Me OP Even at Level 1 vols 1-3
Cage of Eden vols 1-21
The Hero Life of a (Self-Proclaimed) "Mediocre" Demon! vols 1-4
I'm Standing on a Million Lives vols 1-5
The Knight Cartoonist and Her Orc Editor vols 1-3
Am I Actually the Strongest? vols 1-2
That Time I Got Reincarnated as a Slime: Trinity in Tempest vol 1

Check it out here: https://www.humblebundle.com/books/isekai-kodansha-books

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A just ruler amongst tyrants

Eden no Ori is considered as isekai mmm...~?

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I will change this world mmm...
So the world can change me mmm...