FF Divers -
 Sellersville shop has information on certification courses, travel excursions, an online newsletter, calendar of events, and hours of operation available.
http://www.ffdivers.com/

Goin' Down Divin' -
 Informal group specializing in scuba diving vacations, primarily in the Caribbean area for all levels of divers. Includes details and pricing on upcoming trips and past trip reports. Located in Mount Joy.
http://www.goindowndivin.com

Harrisburg Scuba Center -
 Offers details on instruction, travel, and an online newsletter.
http://members.aol.com/harrisburgscuba

Nittany Divers -
 A dive club at Penn State College lists information on courses, rentals and trips.
http://www.nittanydivers.org

Ocean Odyssey Dive Center -
Included are details on instruction, travel excursions, technical diving courses, and contact information.
http://www.oodcinc.com/

Smokeys Divers Den -
 Lancaster dive center with information on certification classes, travel opportunities, photo albums, dive site descriptions and reviews, and store hours.
http://www.smokeysdiversden.com/

Splash Water Sports Scuba and Snorkelling Center -
PADI 5 star Instructor Development Center features information on instruction, travel, an online newsletter, contact details and hours of operation. Located in Pittsburgh.
http://www.splashws.com

Susquehanna Scuba Center Inc. -
 Danville based, with information on instruction, travel, local dive sites, and staff biographies.
http://www.susquehannascuba.com/