I'm guessing this is for the cap swap alone with the EX shifter already existing...or is it a cap swap and conversion from internal to external shifter? If the latter, that seems the deal of the century!
Best, Dan.
One of the advantages of having such things done by SJS* is that they can use OEM parts rather than retail, there is a considerable price difference. I can't recall what I paid without checking the invoice, it was a bargain, the complete job including hub cap was less than the retail price for the external gear mech.
Also - as already pointed out in this thread, don't forget the include the price of a Rohloff specific rotor, currently from £40.
* Other service centres may offer the same, I've only dealt with SJS