From all of my work experience, stuff sold to the taxpayer (regardless of country) comes off the same production line, may get extra inspection (definitely gets billed for extra inspection), gets fancy packaging, and the price goes up by 4X. One example, NASA buys the same semiconductors that your car radio has, I used to make them.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970