A familiar story: after the publisher overprinted the first volume, they under-printed the follow-up volume, making the latter volume sought after.
From the publisher:
The second installment of the Sam Kieth Sketchbook series inclues 48 more pages of never-before-seen art. Working in materials and mediums of all variety, this sketchbook offers a unique glimpse of Kieth's work culled from 25 years worth of notepads.