I'd like to cancel a cheque <a href=" http://www.motelk.com/bosley-propecia-coupon-code.pdf#tongs ">buy propecia usa</a> Several analysts have attempted to value BlackBerry&rsquo;s portfolio and come up with wildly varying figures. At the lower end of the scale, Macquarie has it pegged at $1.6bn. If Mr Watsa believed that figure it would mean he is willing to pay $500m for BlackBerry&rsquo;s operating business. So what does that buy him?