Congressional Budget Office Cost Estimate: S. 883, A Bill to Authorize National Mall Liberty Fund D.C. to Establish a Memorial on Federal Land in the District of Columbia to Honor Free Persons and Slaves Who Fought for Independence, Liberty, and Justice for All During the American Revolution [open pdf - 23KB]
This is a Congressional Budget Office (CBO) cost estimate for H.R. 3523. "S. 883 would authorize a nonprofit organization to establish a commemorative work honoring African-American Revolutionary War soldiers and others. The bill would affect direct spending; therefore, pay-as-you-go procedures apply. However, CBO estimates that the net effect on the budget of enacting the legislation would be insignificant in any year."
Congressional Budget Office: http://cbo.gov