I have bought a second hand manifold that the flexi has blown on, two new flexis cost me £32 off eBay. Planning to cut the old ones out myself then getting the new ones welded in by a local bloke for £40 as I want to keep the car standard. Then going to swap it out for mine with a blown flexi repair mine and keep it as a spare.
Also if you put Clio 197 manifold in eBay there is a place that you can take or send your manifold to they replace the flexis for £179 that is with you taking it off the car yourself though, which I will be attempting once my spare one is repaired.