FEMA Guidance on Procurement for COVID-19.
Federal disaster assistance grants are subject to the federal grant regulations at 2 C.F.R. Part 200, including the procurement requirements found within §§ 200.317-326. These regulations generally require competitive procurement of significant contracts unless"the public exigency or emergency for the requirement will not permit delay resulting from competitive solicitation."
On March 17, 2020, FEMA issued guidance confirming that exigent and emergency circumstances currently exist.
FEMA outlines, however, the minimum requirements that still apply in the accompanying Fact Sheet (both the memo and fact sheet are available here).