In Ireland, non EU citizens get the VAT back (sales tax) on purchases that are taken out of Europe.
You also get your VAT back if you are foreign & studying here and you buy anything in the 3 months before you leave, processed under the same system.
You get a card to make it simple.
Here's more info...
https://www.shoptaxfree.com/tourists/am-i-eligible/
There is even an iPhone app to help you claim back your Tax (up to 21%!)