Try
www.gasbuddy.com there is a great site that shows you the prices from coast to coast up to the minute. Today I filled up my truck at work with diesel and it was 92 cents per litre.
1 gallon = 3.78541178 litres
Depending on where you are going to be coming into Canada you should not have any trouble finding some smoke along the way. Canada is one of the easiest places in the world to find some GREAT bud, especially on the west coast where you will be.
A stoner usually can pick out another stoner like a sore thumb. Don't listen to these dumbasses on here and stick anyhting in balloonns, your ass, your mouth, ground beef or anywhere else. DO NOT RISK GETTING YOURSELF BUSTED over a few grams of weed. Trust me, we have LOTS up here north of the 49 and you won't have any trouble finding it, you just gotta ask/ Up here, people won't call the cops on your ass or think you're a dumb shit just because you ask where to find some pot.
I've travelled across this country from coast to coast and have never ever had any trouble finding ganja, even in the most remote of areas I guarantee you that if you just go up to 3 people who you think could possibly be tokers and say hello, introduce yourself and not be a sketch ball about it, you'll come away with what you're lookin' for.