Congressional Budget Office Cost Estimate: H.R. 3675, Trusted Traveler Reconsideration and Restoration Act of 2019 as Ordered Reported by the House Committee on Homeland Security on July 17, 2019 [open pdf - 30KB]
From the Document: "H.R. 3675 would require the Government Accountability Office (GAO) to conduct a review of the Department of Homeland Security's (DHS) trusted traveler programs, which expedites the security process at airports. Using information about the cost of other GAO studies, CBO [Congressional Budget Office] estimates that implementing H.R. 3675 would cost less than $500,000."
Congressional Budget Office: http://www.cbo.gov/