Navy Frigate (FFG[X]) Program: Background and Issues for Congress [Updated August 13, 2019] [open pdf - 3MB]
From the Document: "The FFG(X) [guided-missile frigates] program is a Navy program to build a class of 20 guided-missile frigates (FFGs). The Navy wants to procure the first FFG(X) in FY2020, the next 18 at a rate of two per year in FY2021-FY2029, and the 20th in FY2030. The Navy's proposed FY2020 budget requests $1,281.2 million for the procurement of the first FFG(X). The Navy's FY2020 budget submission shows that subsequent ships in the class are estimated by the Navy to cost roughly $900 million each in then-year dollars."
CRS Report for Congress, R44972
Congressional Research Service: https://crsreports.congress.gov/