If you're flying from Dublin, the charges are €30 per day in the short term car park, €8.50 per day in the long term car park and €7.50 in QuickPark. There are also some hotels offering parking.
Quick Park is about a mile down the road beyond the long term car park. You used to be able to pre-book over the internet, but this is no lonager available. The saving relative to the long term car park is now a lot less than it used to be.
A word of caution if you are using Quick Park. The last time I used it, I dropped my wife and son off at the airport first and it took me 45 minutes to get back to the terminal. So allow plenty of time.
Next time, I'm going to take a taxi. It's not a lot more and you save all the hassle. However, it depends how far from the airport you live.
Regards
Homer