https://thirdbarrel.com/

Direct shipping from brewery, flat rate €6 for up to 48 cans.

Also available from https://beercloud.ie/  which is a collaborative project where you can order beer to support Irish breweries. Delivery to any address on the island of Ireland is charged at a flat rate of €6 per order. The initiative is explained in this short video: https://www.latest.facebook.com/studio93design/videos/207460990689480/