Volume 25 Bonus Chapter (and Extra Illustrations) : r/OnePunchMan

All illustrations and bonus content from volume 26 : r/OnePunchMan

Volume 23 Illustrations [HQ] : r/OnePunchMan

Volume 25 Bonus Chapter (and Extra Illustrations) : r/OnePunchMan

Vol 24 extras (The rest in Vib's post) : r/OnePunchMan

Changes and Redraws in Volume 24; compared to the online releases. There were only 4 since the chapters were already redrawn, description of the changes is under the images. : r/OnePunchMan

All illustrations and bonus content from volume 26 : r/OnePunchMan

One-Punch Man, Vol. 25: Volume 25 by ONE

Magpie's Nest — OPM Manga Volume 26 Extra Chapter: Big Promotion

One-Punch Man Volume 21 Bonus Poster : r/OnePunchMan