Congressional Budget Office Cost Estimate: H.R. 2383, Secure Communities and Safe Schools Act [open pdf - 29KB]
"H.R. 2383 would prohibit federal funds provided by the Federal Emergency Management Agency (FEMA) under two of the agency's grant programs (the State Homeland Security Grant Program and the Urban Areas Security Initiative) from being used to purchase firearms or ammunition for use by teachers."
Congressional Budget Office: http://www.cbo.gov/