I think he's tried drinkstore already. I've shipped beer in from abroad a couple of times, and haven't had much issue, apart from the odd breakage. Beer Merchants who trade as Cave direct, look to have reasonable enough postage to Ireland of £20.80 per single case up to 20 kilos, so that might be an option. I haven't used them, so you'd need to check out if they have what you want, but selection looks okay, and they have some mixed crates.
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I'm pretty sure that I have used beers of europe before to get beer to Ireland, but not in a long time, as normally I now get my beer deliverd withing the UK, and someone brings it over to me. I can't quite figure out the postage to Ireland, but we are mentioned, so probably worth sending them an email to check what the story is. They have a good selection, and plenty of mixed cases.
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Best of luck with it.