I see them at stores all the time, so I'm not sure I'd worry about it too much. But, you can get the "Universal Templates" from
GW
http://www.games-workshop.com/en-CA/Universal-Templates
Of course, you could just trace or photocopy someone else's out of card board and just take a pair of scissors. My first templates were photocopies of the original
RT blue pages from the front (or back?) of the book