; (2) by redesignating subparagraphs (A), (B), (C), and (D) as clauses (i), (ii), (iii), and (iv), respectively; (3) by striking No task or delivery order contract and inserting (A) Except as provided under subparagraph (B), no task or delivery order contract ; and (4) by adding at the end the following new subparagraph: (B) A task or delivery order contract in an amount estimated to exceed $100,000,000 (including all options) may be awarded to a single source without the written determination otherwise required under subparagraph (A) if the head of the agency has made a written determination pursuant to section 2304(c) of this title that other than competitive procedures may be used for the awarding of such contract. . 804. Extension of authority to acquire products and services produced in countries along a major route of supply to Afghanistan Section 801(f) of the National Defense Authorization Act for Fiscal Year 2010 ( Public Law 111–84 ; 123 Stat. 2399), as most recently amended by section 1214 of the National Defense Authorization Act for Fiscal Year 2018 ( Public Law 115–91