Powers

Not sure what shop you'd buy it from, but you can buy it on-line:
https://shop.jamesonwhiskey.com/p-86-powers-gold-label.aspx
Aslo, as it's now owned ultimately by Pernod Ricard, I would have thought that you could probably order it through most vintners / wine shops, as they should be able to get distribution through the Pernod network.