SAN FRANCISCO (MarketWatch) -- Carnival Corp, which operates Carnival Cruise Lines and Cunard Line, will cancel fuel supplement for new bookings on 2010 departures effective Oct. 31 but at the same time, hike prices, the company said Friday. The company also established specific guidelines to reimburse consumers for 2008 and 2009 voyages. &quot;If fuel prices stabilize below $70 a barrel, we will be able to effectively eliminate a separate fuel supplement,&quot; said Bill Harber, director of marketing for Carnival.