Hi John that is a useful site for the Wicklow Way -wicklowway.com -it gives you lots of accommodation options and I used it to plan my walk. In fact some of the B & B's are the same price, or even cheaper than some hostel accommodation offered in Glendalough-or was when I walked the WW a few years back. Whatever you do stay in The Glenmalure Lodge rather than the, almost as expensive but incomparably grim, youth hostel in Glenmalure. The lodge is a fantastic little pub and B&B and serves up a hearty feeds even if you're not staying there. Alternatively there is a handy little mountain hut on the way down into Glenmalure where you can over night but it is a walk down to the pub and an even longer walk back up! There's also another hut at Brashers Gap just beyond Roundwood and these huts make two good cheap overnight options. The route is really well marked and maintained by 'Mountain Meithal' a great group of volunteers who doe fantastic work maintaining the WW and the Dublin Mountain Way.
Ah Nell, every potential pilgrim should spend one night in the An Oige Youth Hostel in Glenmalure if only to make you all the more appreciative of the comparative comforts of Spanish albergues. The mens dorm in Glenmalure is called :The Icebox' for good reason.
The last time I was on a night hike in the area, I passed The Glenmalure Lodge about 2 am, the last of the locals were starting to leave so those expecting a quiet night might be a little disappointed although I believe the Dowling family have renovated the bedrooms over the last couple of years.
Seamus