Chapter 3, Page 102 (Patreon)

Also, I'll only be accepting new U.S. snail mail patrons for Pogo's letters until April 1.  After that, new patrons to the tier will get their letters by email.  If you're already in the $5+ tier, nothing will change for you.  More info in my comment on the main site:

http://www.bob-artist.com/demon/?id=233