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Not cheap; as the old adverts go they were reassuringly expensive. Obviously you have to buy the glasses off them in the first place so they can send them off.
By the time I’d chosen my tint and the quality of lens (I went to mid-range lenses so I could see over my shoulder better when glancing back through the edge of the prescription section), I think the whole lot came in at £370.
You can find them here https://www.rxsport.co.uk/products/Oakley-Jawbreaker-Prescription-Sunglasses-%252d-Grey-Ink.html.
£?