I live in Canada and when I walked into our local home improvement places I couldn't believe the cost of these plugs! And the cord that went with them.
Came across an ebay listing for the plugs plus 9 feet of cord (the same cord Kal uses on his brewery) for $17 each. http://r.ebay.com/pyrLXD
free UPS shipping in the USA, too. There is a service just across the border that receives packages for Canadians, so I am taking advantage of this.