This is what I paid today for mine:
Front Discs - £49
Front Pads - £23......................(not the cheapest I know, but they were decent supplied parts.)
So with labour, plus VAT you are looking at about £80-100.
There is the option of shopping around, buying the parts yourself and getting a garage to fit.
A lot of garages will also fit patterns. If you want genuine Renault parts expect to pay a little more, despite the fact that there are some decent pattern parts available.
Depends what you want to spend. If you have the time/expertise....fit them yourself. If you dont...get someone who knows what they're doing.