National Telecommunications & Information Administration (NTIA): Funds awarded under the Public Safety Interoperable Communications (PSIC) Grant Program may be used for Narrowbanding projects; funds may be used to purchase equipment that meets Narrowbanding requirements or to educate users about the requirements. Please direct specific questions about allowable PSIC expenditures to PSIC@dhs.gov.
Federal Emergency Management Agency (FEMA) Preparedness Grants: Many FEMA Preparedness grants fund Narrowband activities: Narrowband planning, assessments, training, exercises, and equipment. Current grantees should ask Program Analysts or Grant Program Offices whether unused FEMA funds can be reallocated to Narrowband activities. Entities seeking funding information should visit: http://www.fema.gov/government/grant/index.shtm
Department of Justice (DOJ) Programs: http://www.justice.gov/10grants/
DHS Office of Emergency Communications: Fiscal Year 2011, SAFECOM Guidance on Emergency Communications Grants (pdf)
United States Department of Agriculture (USDA): USDA Rural Development’s Community Facilities Program provides financing through direct and guaranteed loans and grants to units of local government, nonprofit organizations, and Federally-recognized Indian tribes for the development of essential community facilities in rural areas.  Community Facilities loan and grant funds may be used to construct, enlarge, improve or make equipment purchases for educational, health care, public safety and other types of facilities that serve the public.  By funding equipment and upgrades, the Community Facilities Program can support public safety licensees in meeting the narrowbanding deadline.
State Funding: Several States used Federal funding to establish a central fund to assist localities in purchasing Narrowband compliant equipment, and ensuring compliance with the Narrowband mandate. See your Statewide Interoperability Coordinator (SWIC) for more information on statewide compliance efforts, and funding opportunities.