Winter is usually when airfares to the Caribbean go up, not down, but USA3000 Airlines is offering $10 off winter travel for early bookings of flights between Dec. 10, 2006 and April 30, 2007. The offer runs through June 26, is only available online, and requires that you use the promotion code "Winter" when booking your reservation. USA3000 flies to Bermuda, the Bahamas and the Dominican Republic, among other destinations.