This may be impossible to answer, since the data is often not disclosed.

But in an article, about ULA getting RD-180's from Russia it claims:

Each engine reportedly costs between \$11 to \$15 million.

I have never seen prices quoted for a Merlin 1C or 1D, or say an RS-68 (Or RS-68A), an SSME or an NK-33/AJ-26. Comparing different engines in terms of cost could be very interesting.

Of course, an RD-180 has the thrust of 10 Merlins or so, or almost 2 RS-68s or SSME's so probably worth noting common number of units of each used in a typical launcher.

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    $\begingroup$ This seems awfully broad as it currently stands, perhaps a more narrow focus would help? $\endgroup$ – PearsonArtPhoto Apr 29 '14 at 1:38
  • $\begingroup$ Many different dimensions complicate things: reusability, power range, fuel type, throttle range, restartability, etc. Comparing on cost alone (while not in and of itself easy) will be somewhat meaningless. $\endgroup$ – Aaron N. Tubbs Apr 30 '14 at 22:04
  • $\begingroup$ @AaronN.Tubbs Agreed, but it is a starting point. One RD-180 suffices where 9 Merlin 1Ds are needed. BUt knowing the price of both provides insight into design choices made. $\endgroup$ – geoffc Apr 30 '14 at 23:48

We can put an upper bound on the cost of a Merlin; SpaceX quotes a cost of \$135M for a Falcon Heavy launch. That includes 28 Merlins. If you assume the engines are half the total cost of the rocket, that's 2.4M per engine. Of course it could be considerably less...

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  • $\begingroup$ Not a terrible metric. Not a great metric, but a first approximation, I will take it. $\endgroup$ – geoffc Apr 29 '14 at 17:37
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    $\begingroup$ A Falcon Heavy launch costs 85M and Falcon 9 61M. If you approximate the Heavy as a Falcon 9 complete system plus 2 extra first stages, the cost for the first stage hardware is roughly 12M, so the engines are under 1.3M each. $\endgroup$ – ehartwell Jan 21 '15 at 2:56

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