UK - TOMAHAWK BLK IV TORPEDO LAUNCHED LAND-ATTACK MISSILES

ちなみに、トマホークはざっと2から3億円？（$ 2m+くらい。）です。
さすがに米海軍の調達価格は低い（後述）ようですが、どのような経費が含まれているかにより価格は大きく変動するので、読み込まないと何とも言えません。
また、ブロックⅣ、タクティカルトマホーク及び近年のブロックⅤ、このあたりのコンフィグレーションもよくわかりません。
とはいえ、その戦略及び戦術的に実証された性能に対する価格は低い（コスパ大）といえると思います。

https://www.dsca.mil/press-media/major-arms-sales/united-kingdom-tomahawk-block-iv-torpedo-launched-land-attack-missiles

2014年にUKの調達では、６５発の潜水艦発射型を $140 millionで。

UNITED KINGDOM - TOMAHAWK BLOCK IV TORPEDO LAUNCHED LAND-ATTACK MISSILES

WASHINGTON, Jul 1, 2014 - The State Department has made a determination approving a possible Foreign Military Sale to the United Kingdom for Tomahawk Block IV Torpedo Launched Land-Attack missiles and associated equipment, parts, training and logistical support for an estimated cost of $140 million. The Defense Security Cooperation Agency delivered the required certification notifying Congress of this possible sale on July 1, 2014.

The United Kingdom (UK) has requested a possible sale of up to 65 Block IV All-Up-Round Torpedo Tube Launched Tomahawk Land-Attack Missiles, containers, engineering support, test equipment, operational flight test support, communications equipment, technical assistance, personnel training/equipment, spare and repair parts, and other related elements of logistics support. The estimated cost is $140 million.

ちなみに、 In 2016, the U.S. Department of Defense purchased 149 Tomahawk Block IV missiles for $202.3 million.
http://comptroller.defense.gov/Portals/45/documents/defbudget/FY2017/FY2017_Weapons.pdf#page=63

さらにFOTSはこのくらい。$368.53 million　/2022

https://www.dsca.mil/press-media/major-arms-sales/united-kingdom-tomahawk-weapon-system-tws-follow-support
UNITED KINGDOM – TOMAHAWK WEAPON SYSTEM (TWS) FOLLOW-ON SUPPORT

WASHINGTON, March 29, 2022 - The State Department has made a determination approving a possible Foreign Military Sale to the Government of the United Kingdom of Tomahawk Weapon System (TWS) Follow-On Support and related equipment for an estimated cost of $368.53 million. The Defense Security Cooperation Agency delivered the required certification notifying Congress of this possible sale today.

The Government of the United Kingdom (UK) has requested to buy follow-on support for all three segments of the United Kingdom’s Tomahawk Weapon System (TWS). This includes the All Up Round (AUR), Tactical Tomahawk Weapon Control System (TTWCS) and Theater Mission Planning Center (TMPC). The support includes recertification of the UK’s missiles; unscheduled missile maintenance; spares; procurement; training; in-service support; software; hardware; communication equipment; operational flight test; engineering and technical expertise to maintain the TWS capability; and other related elements of logistical and program support. The total estimated program cost is $368.53 million.

Tomahawk Block IV　の解説はこちら。
https://en.wikipedia.org/wiki/Tomahawk_(missile)