Border shopping towns are experiencing an influx of visitors from Northern Ireland, not seen for five years.
The increase in sterling means many shops in the Republic can offer up to €1.30 for the pound.
The boom in trade isn't just confined to retail, with hotels and restaurants enjoying the benefits after years of seeing consumers going the other way. It's also good news for the thousands of cross-border workers who get paid in sterling in Northern Ireland but live south of the border.
"The exchange rate has held now for a considerable period of time and that has boosted confidence," said Toni Forrester, CEO of the Letterkenny Chamber of Commerce.
"We are seeing large numbers of customers coming across from Derry and even from Belfast."
Terry McEniff, owner of the Mount Errigal Hotel in Letterkenny, said: "There is a large boost now from groups coming to the town to shop, especially in the run-up to Christmas."