Time Travel For Sale is a sequel to Lost in Time: Trapped In A Prehistoric World. Jimmy is a scientist who has invented a time machine, and is sent by the government to the Cretaceous period by his own invention for a false murder accusation. There, he is forced to remake another time machine in that primitive environment. When this is finally accomplished, he and his two friends find their way to a utopia of the future. They are fortunate enough to meet a government worker named Tom who has devoted his life to rediscovering time travel technology. He offers Jimmy a deal he can't refuse to share his scientific secrets. Ultimately the two men open a business of tours to prehistoric times. The pair become wealthy from their blossoming business. However, the mayor has gotten them to sign a contract allowing him to control their business. He wants them to charge hunters to accompany them on safaris where they will find and kill dinosaurs of any chosen time period. This presents some very serious safety issues.