David, Yes, there area few good camera shops in Dublin. But their prices for Leica gear are quite high. No rarities, no bargains. Jerry
There are two on Meeting House Square - the one on top of the photo book shop and another one opposite. Both exhibitions change all the time and they're quite good. Meeting House Square is in Temple Bar, behind the IFI (Irish Film Institute). It's worth visiting anyway.
There's Camera Centre in Grafton Street (with Grafton Street prices). They're Leica dealers, but don't expect to find many bargains. There's another place on George's Quay (or Burgh Quay---I can never remember which stretch of the road it is) a couple of blocks west of the Tara St. DART station---they have a fair amount of used gear.