You can go to "business depot". There is one close to Metro Angrignon(the first bus station for No 106). I always buy paper there. $0.49 for 200 pages when on sale.
You will never get a good deal in dollaroma. It is not cheap anyway. You can always find the same thing whose price is only around $0.50-$0.80 in big co-op departmental shops,for example, canadiantire, zellers and business depot, meanwhile, you always need to pay $1.00 in dollaroma.