Two of the best sources in Canada for good dyes for tie-dyeing are Maiwa Handprints, in Vancouver, and G&S Dye, in Toronto. They have stores in those cities, and they will also sell by mail-order to any location in Canada. See my page listing Sources for Dyeing Supplies Around the World.

Look for Procion MX dye, which is fiber reactive dye, the type of dye used in the best tie-dyeing. Do not use a hot water dye, such as Rit All-purpose dye or Tintex Easy Fabric Dye, because they will fade almost immediately. The colors in the shirts you dye with Procion Dyes will last for years.

Most crafts stores sell good tie-dye kits. Look for a tie-dye kit made by Jacquard, Dylon, Rainbow Rock, or Tulip. Sometimes you can find a good tie-dye kit even in a larger store such as WalMart, but often all they sell is Rit dye, which does not work well for making tie-dyed cotton shirts.

To look for additional stores that sell Procion MX dyes in Canada, try Jacquard Products' store locator.

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[This answer was first posted, by me, on Yahoo answers, on June 3, 2008.]