On service, choice and technical savvy the Homebrew Company score very well. They were a breath of fresh air when they opened as prioir to their arrival many of us were relying on Hop & Grape for supplies and while they are a good supplier it would often take a week plus £19 shipping to get the supplies we needed.
I don't believe Walmart (or MoreBeer for that matter) are about to enter the Irish homebrew market any time soon so as I see it the best way of having access to a wide range of quality products at a good price with next day delivery is to make sure that it's in the local suppliers interest to provide and expand this service. This is already happening and will continue to happen if it is a viable business for the supplier.