The newest, Stratosphere Boogieman, will soon also be available as a hard copy. I just sent it (including inside b/w illustrations) to the printer, today.
The first two, Shake, Rattle & Rocket! and Ghost Saucers In the Sky! are already available as hard copies. Just $10.00, each.
DC Larson/Retro Riff Books
322 E. Louise St.
Waterloo, Iowa 50703