Most of these are available locally at Rockport Blueprint in Camden, where you can get a 10% discount when you let them know you are buying for an adult ed class. You may also find them at Huston-Tuttle in Rockland. If you would like to see materials for this class ahead of time, here are links to the items online:

https://www.amazon.com/13-8InX13-4In-35cmX34cm-Half-ripe-Calligraphy-Painting/dp/B082B7C2SJ/ref=sr_1_9?crid=1Q6BMH9MSY7RR&keywords=chinese%2Bpainting%2Bsupplies&qid=1651288434&sprefix=chinese%2Bpainti%2Caps%2C119&sr=8-9&th=1

https://www.amazon.com/MEGREZ-Practice-Beginning-Japanese-Calligraphy/dp/B083XZKTZW/ref=sr_1_22?crid=1Q6BMH9MSY7RR&keywords=chinese%2Bpainting%2Bsupplies&qid=1651288497&sprefix=chinese%2Bpainti%2Caps%2C119&sr=8-22&th=1

https://www.amazon.com/Easyou-Coloring-Painting-Practicing-Calligraphy/dp/B0728L766H/ref=sr_1_14?crid=1Q6BMH9MSY7RR&keywords=chinese%2Bpainting%2Bsupplies&qid=1651288634&sprefix=chinese%2Bpainti%2Caps%2C119&sr=8-14&th=1