This article says the 2008 event cost €19m (EBU paying €10m) and the 2007 one cost €11m, another one mentions Greece spent €9m in 2006. This article mentions a BBC cost of £173,000 (€217,933), although I read elsewhere that the "big four" pay 10% of the EBU costs each, so it sounds a little low compared to the €10m cost mentioned.