I was not able to find anything comparable in Canada to the tower.
Do you live near the U.S. border?
I had the tower shipped to a service near the border that will accept shipments for you. It is a one-hour drive for us to the border, so it was a really easy way to get the tower without paying any shipping fees (shipping was free on amazon.com). We just explained to the border guard that we couldn't buy this equipment in Canada, and so we weren't charged any duty.
I hope you can find someway of getting yourself a tower because its a great piece of equipment to have.