Ireland's VAT (sales tax) is 23% so higher than the 20% in the UK and all films are cheaper in the US anyway even Ilford so you'll save very considerably, but of course you will be limited to what you can carry in your hand/checked baggage. Check out some prices you'll be rather surprised.
Ah. So I was considering buying Delta 400 as a roll and putting it in a bulk loader and taking it with me, rolling out my films as I needed them. You're saying I should absolutely do that.