Get ready for the Canada Post rate increases effective March 31/14. They are scary! I use Oversized Lettermail. How the increases will affect me as well as my customers:
*Canada with GST - Now $1.41 / March $1.89
*US with GST - Now $2.31 / March $3.10
*International with GST - Now $4.58 / March $6.20
For details you can view the 2014 rate sheets in the right hand column on the following Canada Post page