Chemstores sells helium for balloons on campus at price of $0.75 per balloon through both account and cash sales.  For major events (more than 25 balloons), the ballon mix helium cylinder can be moved to various locations on campus for users to fill their own balloons.  There is an additional cost of $10 per weekday that the cylinder is on site, and the user must track the number of balloons filled.  Users are provided with eye protection and a brief safety orientation.