Jameson 18yr old is very expensive. Almost as expensive as Midleton Very Rare. I've had a bottle of Midleton but never yet tasted the 18yr old.
Redbreast is made by Jameson. it used to be made in Dublin.
About 40 odd years ago the remaining Irish Distillers amalgamated into "Irish Distillers". All the whiskey is made in the enormous distillery in Midleton Co.Cork. Includes Paddy, Power's, Jameson, Jameson 12yr old, Jameson 12yr old distillery reserve, 18yr old, Midleton very rare, Redbreast, Tullamore Dew, Dunphy's, Green Spot etc.etc. The ones which aren't made here are made by the Cooley Distillery in Co.Louth, a newish distillery which revived some old names.
They make Connemara, Tyrconnell, Michael Collins, Kilbeggan, Locke's, etc.
Finally, there's Bushmills in Northern Ireland. They make good Protestant whiskey to sear the throat of any Catholic who might dare drink it!!. Their whiskies include Bushmills, 10yr old Malt, Black Bush, Choke the Pope, Hang the Papish etc.