Baumann's in Dungarvan is reasonably good for tackle and, on most weeks, can supply you with frozen crab, mackerel, sandeel and (sometimes) lug. Thing to remember is that Baumann's is actually a jewellers with a section at the back for fishing, so don't let the prices in the window give you a fright

If old Baumann himself is there, he's usually fairly good for a bit of info about what's being caught where.
If you want fresh crab, send a pm to the ever-reliable Bhoy32 on this site--he'll sort you out. Good digging on lots of local beaches at the minute too. Let us know how you get on ...