Here are some links to local groups and resources, and national links to co-ops and other relevant resources.

Local Friends and Partners

The Breathing Room Foundation

Cheltenham Adult School

Cheltenham Art Center

Cheltenham School District

Cheltenham Township (Municipal Government)

Cheltenham Township Historical Commission

Eastern Montgomery County Chamber of Commerce

Elkins Park Hazon CSA at Kol Ami

Friends of High School Park

Greater Glenside Chamber of Commerce

Old York Road Historical Society

Pennsylvania Association for Sustainable Agriculture

Here is a list of several co-op directory sites that should help you find whatever co-op you're looking for:

Blooming Prairie Foundation

Co-op America 

Co-op Directory 

Co-op Domain Registration:

Co-op Power  

Cooperative Development Services (CoCoFist) 

Cooperative Grocers Information Network 

Cooperative Grocer Magazine 

The Energy Co-op 

Equal Exchange 

European Community of Consumer Cooperatives

Fair Trade - Transfair USA 

Food Co-op 500 

Frontier Co-op 

National Co-op Bank 

National Cooperative Business Association

National Cooperative Grocers Association

United States Federation of Worker Cooperatives  

University Of Wisconsin