I have many Janice VanCleave science books with experiments for kids. Asking $5.00 each.
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They are popular with homeschoolers and to supplement school courses for inquisitive kids. They worked well to turn my daughter onto science. All copies are in excellent condition, some like new. A spot check of Amazon showed a price range of $12.00 to $16.00 new depending on the title (if purchasing directly from Amazon; some third-party sellers were cheaper).
"for Every Kid: 101 Easy Experiments that Really Work" Series
Biology, Physics, Astronomy, Ecology, Chemistry, Earth Science
Spectacular Science Projects series ("Mind-Boggling Experiments You Can Turn into Science Fair Projects")
Molecules, Solar System, Rocks and Minerals, Electricity, Magnets, Earthquakes, Weather
The Human Body: Easy Activities that Make Learning Science Fun