Sounds like the price per unit has decreased each year, but recently it exceeded the F-35. Perhaps the F-35C variant price per unit was/is higher at some point?

With a price tag per unit higher than the F-35, the CH-53K — approximately $138 million per aircraft — costs about three times that of its predecessor the CH-53E, which costed roughly $45 million per aircraft ($24.36 million in 1992 adjusted for inflation).

Rep. Vicki Hartzler, R-Missouri, during a June 30 hearing of the subcommittee on Tactical Air and Land Forces for the House Armed Services Committee, asked Lt. Gen. Mark Wise, the Corps’ deputy commandant for aviation, about the cost of a CH-53K King Stallion being $125 million, more than the cost of an F-35 strike fighter. She noted the proposed 2022 budget requested nine CH-53Ks, down from the 11 planned earlier for 2022. She also asked if the Marine Corps’ requirement for 200 CH-53Ks would be reduced in light of the Corps’ planned reduction of heavy helicopter squadrons from eight to five.

Wise replied that unit cost for the CH-53Ks in Low-Rate Production Lot 5 in fiscal 2021 was $97 million and for Lot 6 in fiscal 2022 was projected to be $94 million, lower than the cost of an F-35, “and trending in the right direction.”