I went into a dedicated whiskey shop just recently and asked the same question. The owner of the shop said it got difficult to obtain after the Euro came in. She thinks it is another bit of meddling from the Eurocrats that have made it difficult to export from Ireland.

Difficult to reason why as the well known brands still hit the shelves. I purchased a bottle of Tullamore Dew instead, which she said is on par with Gold label. Nice but not convinced.