Gr 4-6 Shelley, disappointed that her family can't afford the extra $45 for summer camp, decides to earn the money through a swap-and-sell scheme. Her portable garage sale earns her publicity in the local newspaper, but one consequence of her enterprise is the near loss of her best sixth-grade friend, Anna. Shelley's lack of free time causes her to neglect not only her friend but also her family and family pet. Realization that there needs to be a time for everything and a balance between them fortunately dawns on Shelley in time. Whether this novel would help would-be entrepreneurs is debatable. Jerome Potter, the ``barter, buy, or trade'' kid who teaches Shelley the techniques (sometimes somewhat shady) of advertising, expansion and salesmanship, is an interesting character in a book in which most of the characters are pretty blah. The pace is slow, but the plot is different from the usual. A very additional purchase. Rita S. Padden, Wenatchee Public Library, Wash.