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You can replace the faulty
yourself, its just one hex bolt on top then pull it off and unplug the other end. You would have no doubt done that when you changed the spark plugs (assuming you changed them yourself).
You just need to work out which one is faulty. To do this unplug the electrical connector to each injector one at a time. The one that you unplug that makes no / little difference to the cars running will be at fault.
Not sure how much they are to be honest, but they wont be a great deal each. You can get them from various sources, not just Renault.
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo