We will be using Cosmopolite from Hachette as our textbooks. You will need to purchase Le livre de l'élève and le cahier d'activités at the level of your class as shown below. Make sure to get the code to access the audio part of the books. A used book will not have the code. It may have a CD (the retailer should say this), but it will require you to have a CD player and can be a bit cumbersome. You do not need to purchase parcours digital but very often it comes with it. It is more exercises online with self correction. It is around $60 plus shipping for a pair of new books (the textbook and workbook for your level). Both new and used versions can be found on on-line book retailers such as AbeBooks, ThriftBooks and Amazon.
If you like a grammar book to go along, we recommend the one below (level A2/B1). It is not required at this time.