Leaving it a bit late to sort currency arent you??
The best value for money is to get it changed into euros at your bank at the exchange rate instead of the rate set by travel agents as travel agents buy currency in bulk and sell it at a lower rate. They then claim that it is "commision free", which in a sense is true, but definately not good value. Your only worry then is what to do with the money when you are over there, if there is more than one of you then maybe sharing a safety deposit box will save you all a bit.