As a way to weather the turbulence of the current state of the money-management sector, Liberty Financial reports that it is considering putting itself up for sale. The Boston-based company has already sold its wealth-management business, the Private Capital Management (PCM) unit of Stein Roe & Farnham, to a start-up jointly owned by PCM's current management and an outside investor group for $40 million. The move is one of several "strategic alternatives" Liberty says it is exploring as a means to cope with the changes taking place in the sector. As many as a half dozen acquisitions and takeovers occurred in October alone. If Liberty goes through with the plan, analysts say insurance companies, banks, and European firms should all be considered possible suitors. Liberty, which has $77 billion in mutual funds and other assets under management, could attract as much as $40 to $45 a share, or $2.3 billion.