I just did a quick internet search so can't tell you anything about the products. Places to buy weighted blankets are listed here. Looks to be US based but imagine online places ship to Canada.

http://www.friendshipcircle.org/blog/2012/02/13/weighted-blankets-13-stores-to-choose-from/

http://www.myweightedblanket.com

Made to order and machine washable from Calgary
http://www.hippohug.ca/products/weighted-blankets/