The City of Green Bay distributed several thousand masks, both disposable and reusable, at Casa ALBA, COMSA and Boys and Girls Club. There are also masks available for visitors to the Bay Beach Pavilion.
Many thoughtful and resourceful community members have made masks, and are giving them away. Check with neighbors, co-workers, friends and family, and also with the volunteer center, https://volunteergb.org/
Stores and web-based retailers sell masks, both disposable and reusable (which need to be washed with soap and water after every use). Please check places such as Target, CVS, Walmart and Amazon.