You can make your check payable to CDHSAA and mail it to CDHSAA, c/o Betty Miller, 4104 Hillsdale Rd., Harrisburg, PA 17112 (a self-addressed envelope would be helpful).
UPDATE: You probably thought the CDHS Alumni Association was nearly perfect... well, even those that are nearly perfect, make mistakes on occasion. So, here's the situation:
CJ’s Tire & Automotive (#9 on the list) is offering “$15 off any purchase" rather than "10% off". Please make a notation on your card.