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To the total estimated cost of seven billion CHF, between half a billion and two billion ought to be added for the four detectors (on the basis of the cost of the LEP detectors for the former estimate, and of the LHC detectors for the latter). This total cost can be related to the Physics case of the collider -- the main topic of this note -- by inferring the cost of each Higgs boson. From the statistics expected after five years of data taking at $\sqrt{s} = 240$ GeV (Section~\ref{sec:Higgs}), each Higgs boson would amount to 4000~CHF, to be compared with 150,000~\$ at the ILC (not including the cost of the site construction and the infrastructure). If the TLEP project is considered as an add-on of the CERN's Energy Frontier 100 TeV pp collider, the tunnel, the tunnel services and the magnets (which could be used for the VHE-LHC injector) need not be counted in the TLEP price. The cost of a TLEP Higgs boson further decreases to 1500~CHF per Higgs boson, making TLEP a much more cost-effective Higgs Factory than any other project on the market.  The length of the tunnel will be optimised on the basis of geological and accessibility criteria. For example, a tunnel of 100 km (shown in Fig.~\ref{fig:TLEP80}) might not be more expensive than the 80-km version, the price estimate of which is given in Table~\ref{tab:cost}. Indeed, a 100-km tunnel would avoid the limestone areas in the vicinity of the Sal\`eve mountain (more difficult to dig), and might not require digging either challenging 1-km-deep shafts or a 30-km bypass tunnel needed to access the caverns underneath the Sal\`eve mountain (Fig.~\ref{fig:Profile80}, taken from Ref.~\cite{cite:Osborne}). With such a tunnel, the physics case would be enhanced with a 20\% larger luminosity at all centre-of-mass energies, and it would possible to increase the maximum centre-of-mass energy by 5\%, 5\% with the same RF voltage,  should there be an interest to do so. A feasibility assessment for the 100-km version of the TLEP tunnel is ongoing.