American Association of State Colleges and Universities: Office of Federal Programs

This organization is composed of more than 430 public colleges and universities. Their interests are quite wide-ranging, but one includes listing grant opportunities for member institutions. This database, "GrantSearch" is obviously searchable, and seems to be fairly broad -- a search for "economic" yielded almost 90 "hits." Further, most seemed "reasonable" -- that is, it is easy to imagine a few economists interested in most of the offerings. To access this database, it appears that your institution must be a member of this organization.

http://www.aascu.org/grc/