heres one for flights:
http://www.cheapestflights.co.uk/Cheapest/Common/FlightSearchResult.htm
heres one for accommodation:
http://www.cheapaccommodation.com/Dublin/

you will have to alter the dates on the flight page

No problem RYANAIR.com

try orbitz . com and cheaptickets. com…

Try http://www.flyzoom.com

check out http://www.smartertravel.com sign up for their newsletter and it will send you links to other websites offering deals. I believe it searches all the other travel websites for you. They just had a bunch of specials for travel in Europe. Just make sure to pick the airport you would be leaving from and the newsletter comes once a week. good luck and have fun. PS Another good website is http://www.bookingbuddy.com or even http://www.sidestep.com

Ryanair for flights or Aer Lingus – very low cost flights.
Accomodation – try Irish tourist Board.
It isn’t cheap once you get here, hotels are expensive. Best to try for a bargain package.

have you tried freedom direct .com ? they`re pretty good, if you type it in and end up with something totally wrong, ( it happened to me) try typing in freedom direct .com holidays and you should end up on the correct site. i have just been looking for o break to spain and found some brilliant deals. good luck. or try bmi baby .com. or easy jet.

Ryanair for cheap flights. But it depends what country you are coming from, your own country may have a cheaper alternative.
Tripadvisor for ratings and prices of accommodation.

The best website which I have found to date for flights is: http://www.cheapflights.co.uk
On this site i have got return flights to Mexico in the past for £99 and return flights to Canada for £98. I am the cheap flight kid and this is the only site which offers the cheaper options.

Source: I go away on holiday a lot!

In terms of accommodation in Dublin I would highly recommend getting hold of the Lonely Planet Guide To Ireland or Dublin. I use these each time I go away and they are invaluable as they have lists of cheap accommodation as well as middle and higher price. You do not even have to buy the guide just go to your local library and either reserve it or get them to buy it which is what I do.
Check out: http://shop.lonelyplanet.com/product_detail.cfm?productID=2844&affil=lpdp
for details of the most recent Lonely Planet Guide book to Ireland and Dublin. If your library does not have it check out either Amazon or Ebay to get one cheaper and you can always sell it on when you have finished with it!!

P.S cheapflights.co.uk are showing flights for about £82 for February but they change every day and the further away you book them the cheaper they can be! RYANAIR can be good as well but they have really cut down their luggage allowance and penalise you if you take more than they now allow.
Ryanair are showing prices of about £39.58 return for February leaving on the 5th and returning on the 10th Feb!
http://www.ryanair.com

look on Internet some places do good deals.Maybe you could try a B&B to stay in they are cheaper

http://www.travelsupermarket.com is good- they’ll compare a few airlines for you and come up with loads of accommodation. If you’re going the same weekend a rugby international is on there’s no way you’ll get cheap flights, they’re around that time

expedia is really good

Both Ryanair and Aer Lingus have good deals if you book in advance time. You will get a good price if you book 2 months ahead of your journey.
Otherwise try:
http://www.expedia.co.uk
http://www.tripadvisor.co.uk
http://www.octopus.co.uk