All the materials in A Form-Function English Grammar series are currently available for purchase via Amazon.
Elementary Series
Level 1
Level 2
Level 3
Level 4
Level 5
Level 6
Level 7
Forthcoming
Level 8
Forthcoming
High School Series
Level 9A
Level 9B
Level 9 eBook
Level 9 Workbook
Level 10
Expanded Distribution
The workbooks and textbooks in the A Form-Function Grammar series are also available for expanded distribution in Australia, Canada, France, Germany, Italy, Japan, Spain, and the United Kingdom via Amazon.