That is crazy! Unless it is super new and improved rubber of some sort! I bought one from Ebay for about 6 bucks U.S. with free shipping. Oh and it is OEM Blackberry.
It's not necessarily overpriced. I've never dealt with Canada Futureshop but if they are a new startup or the manufacturer of thier rubbers is new, they are just trying to cover their tooling costs.
Basically, they are trying to enter a market where they are sorely outnumbered.