Online:
Directly from PG: $12, shipping included
SPD
Amazon
In person:
Bookhouse (Jonesville, MI)
Book Soup (LA, CA)
Carmichael's Books (Louisville, KY)
Normals Books (Baltimore, MD)
Pilot Books (Seattle, WA)
Skylight Books (LA, CA)
RISDWORKS (Providence, RI)
Symposium Books (Providence, RI)
Woodland Patterns (Milwaukee, WI)