We have the same situation here in Denmark, where Renault however does carry some stock of Espace spares, but only at ridiculous prices. I have never come across a second source of the Espace V6 24v coil pack, I'm afraid, but if you want I may be able to help get my parallel importing Renault parts dealer here in Denmark to send one to you in Finland. He's usually 50-30% cheaper.
http://www.birkegaardens-autodele.dk//Anders