TORONTO - Sears Canada's stock has plunged this morning following a news report that it's preparing to seek bankruptcy protection within weeks. The shares (TSX:SCC) fell 25 per cent to 60 cents on the Toronto Stock Exchange shortly after the open Wednesday. The stock had already declined from $1.14 on June 12, prior to a company warning that there was "significant doubt'' about its future and that it could be sold or restructured. Sears Canada ...