Camp Abilities
Camp Abilities is a summer sports camp program for children with visual impairments, with adapted sports and sometimes sleep-away opportunities.
https://www.campabilities.org/
American Printing House for the Blind
While not specifically a sports-related website, APH does sell sound makers, beeping balls, and other sports-related equipment.
https://www.aph.org/product-category/educational/physical-education/
Envision Blind Sports
A non-profit organization helping blind and visually impaired people engage in sports.
Blind Kids Life 