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I recently sold my brand new monarch plus rc3 for £175, which included manual, pump & volume spacers; I had a real problem trying to set a price because if you check eBay they can vary from £100-£300 depending on the size & tune...
In the end I took the middle ground and put it up for £200 whilst at the same time being genuine that I didn't really know the value, so was open to offers.
A quick check of sold monarchs on eBay suggests he should expect anywhere between £110-£160 for brand new removed from bike shock.
Most popular size so that's good.
R model is OE with less adjustment though, so £150-170 if it's the M/M tune.
Perhaps less if any other tune.

