I have some bad news.
The US Post Office just raised their shipping rates as of Jan 18, 2016. Although it has been a couple years since their last major increase, for some, this one will be a doozie depending upon which shipping option you choose. My new shipping rates are now as follows:
1st Class US Shipping: Flat $3.50
Priority 3-Day (not guaranteed): Flat $7.25 (included up to $50 insurance)
Canadian Shipping: Flat $11.00 (no insurance or tracking included)
Shipping insurance for US shipments only starts at $2.20 and goes all the way up to $5.80 depending upon the amount of insurance you need.