Reckon this question will come up quite frequently given the shares have been recently appropriated to all current and ex-EI employees.
I've been trying to do a bit of digging but could only find quotes for Goodbody and Davy stockbrokers both of whom offer online trading.
Goodbody look like they charge a minimum commission of €32 per transaction or a % charge depending on the value of the transaction if it would generate a higher commission than the min.
Davy look like they charge a minimum commission of €25 per transaction with a similar % charge as Goodbody.
Couldn't find any more detail online so if anyone else can find out more please post..!!