Homeland Procurement Reform Act or the HOPR Act This bill directs the Department of Homeland Security (DHS) to: (1) procure certain critical equipment of the quality and innovation necessary to carry out effectively their security, enforcement, and investigative missions; and (2) ensure that funds appropriated or otherwise available to its frontline operational components are used for the procurement of covered items only if they meet specified criteria (e.g., that the supplier agree to store items not assembled in the United States in a locked area, report theft of insignia before delivery to the government, destroy defective items with which the insignia is included, and maintain records of such destruction). "Frontline operational component" includes: (1) U.S. Customs and Border Protection, (2) U.S. Immigration and Customs Enforcement, (3) the Transportation Security Administration, (4) the Coast Guard, and (5) the Secret Service. "Covered items" include: (1) body armor components intended to provide ballistic protection for an individual, (2) helmets that provide head protection, (3) respiratory protection equipment, and (4) any other critical safety item as determined appropriate by DHS. The maximum uniform allowance for an agent of a frontline operational component shall be $1,200. This bill: (1) does not apply to any procurements by a vessel in foreign waters, nor in response to a situation covered by a presidential disaster declaration; and (2) applies to contracts entered into by DHS or any of its component agencies on or after October 1, 2018.