This term the College of Dupage has changed the textbook series they use for the Adult ESL program. They are now using the Cambridge University Press series called Ventures. It includes the following levels: Basic, 1, 2, 3, 4, 5. These book levels correspond to the COD class levels from 0/1 to 6.
I just spoke with the representative from Cambridge University Press. She said that students can access the materials for Ventures at the Student Arcade. This includes the audio.
For libraries that still want to purchase print copies for students, she recommends buying the value pack for each level, which should include the student book with CD and the workbook. For the basic level, there is an extra “literacy” workbook which you might want, too.