Well., 'according to Google: -
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Adjusting $6 million from 1973 for inflation puts The Six Million Dollar Man's cost around $32 to $40 Million today, but factoring in modern technology and R&D could push it to $100 million or more, with some estimates reaching tens of millions for just the parts due to advanced healthcare inflation.
The actual cost depends heavily on whether you're just inflating the original figure or re-engineering his cybernetics from scratch with today's tech.