Flights to
Munich from Dublin 2nd of dec to 5th of Dec
€81
Car hire
€84
Then you have nearly a hundred ski resorts to pick from within two hours of driving, and a lot of good ones in that selection. Plus if you can find some friends to come along you will find that spliting the cost of getting to the resort is less, plus that cost of car hire was for a 24 year old male.
Next you can book a place to stay in a B&B outside the resort or in the resort, if your outside the resort it would be cheaper plus you can also check out different resorts easily. While if your in the resorts, then its party time lol. So depending on how you could do it, you could possible keep a trip away for less the 600 euro