ALL CITY RECORDS in dublin if you are ok with just using spray paint,

http://shop.all-cityrecords.com

they have a full range of Montana 94 Matte spray paint, shitloads of colours to choose and its very hardwearing and the coverage is very good as its made specifically for graffiti!you can also get different Caps so you can spray precicely or have a wide coverage cap!

iv personally used it and found it savage although the colour i chose was just worng but that was my own choice!haha