Starwood Preferred Guest members can purchase points at a 20 percent discount through Dec. 31, 2009. The cost of points has been reduced from $17.50 per 500 points to $14 per 500 points and members can purchase up to 20,000 points in a calendar year. A minimum of 500 points is required and points do not count towards elite status. Visit http://www.spg.com/starpointpurchase to purchase points.