Williaam Cox in Cloverhill Ind Est(Clondalkin). http://www.williaamcox.ie/ They can cut whatever size you want, but you prob have to buy a whole sheet.
[broken link removed] are moving to Ashbourne tomorrow. Their new address is Unit 16, Ashbourne Industrial Estate, Ashbourne, Co Meath - 01 801 0022 . Used them recently and found them fairly helpful.