Prices might be out of date as from an old thread. Plus think the cam tensioner sometimes needs replacing and that is the pricey part, circa £300.
chain - part no. S06D109229B RRP £42.06
tensioner - part no. S06F109217A RRP £66.53
gasket - part no. 06D103121B RRP £4.13
seal - part no. 06E127248 RRP £5.57
gasket - part no. 06F103483D RRP £15.61