やっぱり国務省の見積もりは6 billionだな。

https://dsm.forecastinternational.com/wordpress/2022/04/06/poland-inks-m1a2-abrams-tank-contract/

Poland Inks M1A2 Abrams Tank Contract
April 6, 2022
Poland made official its M1A2 Abrams SEPv3 main battle tank (MBT) procurement
to meet an urgent operational requirement with the signing of a roughly $4.75 billion deal on April 5.


The Pentagon’s Defense Security Cooperation Agency (DSCA) notified Congress earlier on February 17 of the U.S. State Department’s approval of
a government-to-government Foreign Military Sales (FMS) request by Poland for M1A2 Abrams System Enhancement Program version 3 (SEPv3) MBTs.
The FMS proposal covers acquisition of 250 Abrams tanks, plus associated training and equipment (counter-IED systems, machine guns, ordnance, spare parts, etc.),
26 M88A2 Hercules combat recovery vehicles (CRVs), and 17 M1110 joint assault bridges.
Altogether the proposal comes with an estimated price tag of $6 billion.