A good few clubs based around Dublin. Some of them with great availability's
Theres Trim flying club based in Trim. I think they are taking on new members, then you have DublinFlyers based in Weston, The Hotel Bravo Flying club, also based in Weston .You also have East Coast based in Weston, not a flying club, but the rates are good. Think around 180per hour , which is pretty much similar to other clubs.
With clubs you will have monthly fees so take that into consideration, it all depends on how often you are willing to fly. Obviously the more you fly, you will justify the monthly costs.
Theres also flying clubs in Newcastle and Abbeyshrule, which I'm not that familiar with.