Where can I buy cheap Sennheiser headphones in Canada?

Personally, most of low end Sennheiser headphones aren't very good. PX100 are fine, I guess.

Their prices in Canada is ridiculous too! They're charging a hundred bucks for the CX300, and higher prices for all the other stuff. The only thing I saw that was being sold at a good price was the Sennheiser IE8, which I doubt you'd want, since it's 349.99 and because it's an IEM. (It means that it goes inside your ears. Not like earbuds, but deeper inside.)

Try NCIX, and Canada computers. Oh, and remember to avoid the CX series like a wildfire.

EDIT: Oh wait, why do want to buy it in Canada? Your flag says you're living in the us.

 

I think the only worthwhile product in your range is the PX100. If you stepped your budget up, you might be able to get something better.