My favourite supplier is Loopy Ewe. They're now based in Colorado and had the timing been right I would definitely have gone to visit them in Fort Collins.
They're helpful when I have queries and being a grey nomad they happily send my yarn anywhere in the world and there has never been a problem or missed parcel. My delivery addresses probably now total about 10-15!!
I've recently tried these square needles which are shipped free worldwide from Bob and Nancy's Services they also have yarn and Addi Needles too.