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Where do people find those great "hidden" deals on airfare? - airfare sales

We have just spent several hundred miles away from our family. My family comes to visit, but do not go my husband's family for a while. We would like to see them, but we would need a very good deal, since there are four of us are. I've heard from people that this is really big on flights with "secret sales" or something like that. Where can I find them?