1st class should be about $3.50 -BUT- it has been my personal experience more mail goes missing in Canada than in any other country due to their privatized postal service, mail strikes, etc. You can't get insurance, etc if you ship 1st class which means you are taking a risk shipping that way. I do a flat rate small box for $14.00 which hold 4 or so bars depending on size and shape. I will ship 1st class to repeat customer if they agree to not hold me responsible for loss.