Prestige furniture just beside Woodies at the Nass road/long mile road intersection. Take the first left after the red cow round about (heading towards Dublin)
Ask for Emyln and he'ill give you a good deal, particularly if you are buying a few beds. Tell him Donking put you on to him.
If prestige don;t have something that suits your requirements and budget, you also have bargain town around the corner in the Liver retail park (opposite Macdonalds).
You will also get quite a few furniture shops along Kylemore Road towards Ballyfermot.
Shop around and you should get a deal