I am planning a trip to Germany and need advice on cheap tickets,best time to go

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I am planning a trip to Germany to visit my nephew and was wondering if any one could give me hints on finding cheap tickets. I have been searching the web today and really haven't come up with any real specials. If I'm not particular about a certain date can I get better buys by waiting until the last minuet? Also what time of the year is best to go?