for a cheap option i've just used this: from b&q, put it on with a roller and brush with suprisingly good results!! :D
http://www.diy.com/diy/jsp/bq/nav/nav.jsp?issearch=true&fh_search=international+matt+black&selected=products&x=37&y=9
i've no ended up with a flawless finish but for £15...