New Ireland and some other funds are available at discounted rates through execution-only brokers (such as MyAdviser.ie). It's effectively a commission refund negotiated individually by the broker, so New Ireland themselves won't provide specific details on it.
That was an offer MyAdviser posted on AAM a while ago, which is where I got it from. I don't have any more specifics I'm afraid.
If this is a genuine investment query rather than an academic exercise, you could approach a discount broker with a narrow set of requirements and see what the best offer they have is. To discourage time-wasters many will charge you a small fee if you don't complete the transaction. In the context of a serious €100k investment that really shouldn't be an issue.
oppenheim have one, not sure if your contrib would be large enough..
their's is at .5%...think biam have a low charge as well...considering their recent offings...