Where Can I Find A Really Cheap Plane Ticket To The Bahamas

Hi, I am Trying to Find the Best Deal is Where to get a plane ticket to the Bahamas for christmas.When Are The Best Times "during the week and times to look for one and where.I Have Tried All Of The Major Sites Such as Orbitz, Travelocity, Expedia, Cheapflights, etc.I am really running out of time.Also, has anyone Bought a plane ticket and departure The Day Before It Was Really cheap.Is person recording it to Wait Until The Day Before it get a cheap ticket ? Thanks