A lot of UK based companies have .ie websites for the Irish market. It isn't until you have purchased the item that you realise you are buying from the UK. This wasn't an issue pre Brexit but can be now. Thankfully, I haven't been lumbered with extra charges yet but there is a noticeable delay in getting the packages delivered. Being able to track your package, you can see it being picked up from the seller within a day or 2 and then going nowhere for a week before suddenly going out for delivery.
Ordered 2 Vorwerk vacuum cleaners from their .IE site on the 15th of January - I knew though it will be routed via the UK. They arrived only today - normally it would had been 5-7 days... Thankfully no extra charges.
I will need some more accessories but I will get them via their German site (also because they are cheaper and you get more extras in Germany)