• SAMHSA - current grant opportunities.
• NIH Grants and Contracts Page
• NIH Guide a list of all NIH requests for applications.
• National Institute of Justice funding opportunities.
• ScienceWise Search for federal and private foundation funding.
• Find Foundations  with this search tool from the Society of Research Administrators.

Also, see about getting our funding opportunities newsletter and visit our Join Together news page under Funding News to keep tabs on up to date trends.