If you clicked the link I posted, it should have given you a price of just under $30. Maybe it's already converting to Canadian $ for you.

[on edit] I just checked amazon.ca and they want $50 for a gallon of the same stuff. Holy #%!*, they're ripping you guys off.
Maybe somebody can buy a $30 gallon for you in the US and mail it to you. No idea what postage would be, but would have to be less than $70.