I've just been onto MB UK website. It seems the largest you can spec on a C class (the C63S car), is 19" wheels, fitted with 245/35 on the fronts, and 265/35s on the back.
Two minutes of work on blackcircles.com (other tyre websites are available) found me the MO (Mercedes Original, so the 'approved' tyres) as Pirelli P Zero.
£164 fully fitted for a front tyre
£202 for a rear tyre.
That makes £366 total to me, whereas he's paid £450 per tyre. And that's for the worst-case scenario. If he's got 16" or 17" rims on, then the tyres probably shouldn't be much more than £100 a piece.
I don't usually go in for gratuitously rude, but in this case I'll stand by my previous comment of lazy or dumb.
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