There are numerous books (50+), booklets and other products available from FIGU-Shop (Switzerland). Although most of the material is in German only there are some books and booklets translated into English, Japanese, Italian, Spanish, French, Czech and Russian.
Booklets 1-7 $5 each plus shipping
77 Meditations - flip booklet 4.25" X 5.5"
$10 CAD (plus shipping)
German / English
'Billy' Eduard Albert Meier