I have tried Connecting Threads, and they don't ship to Ireland. I also tried Thousands of Bolts, as they had loads I wanted. In spite of them telling me they ship overseas to loads of places, their website wouldn't let me pay. I could put in all the order, but then it said it didn't recognise my address. I contacted customer services, who said they would order for me, but four weeks later, I gave up trying.
Hancocks of Paducah do send overseas, and I have had a lot from them, but get a little frustrated with back orders trailing in long after the rest has arrived.