Amazon has Scientific Explorer Awesome Aerospace Science for $4.50. This is 77% off from the regular price of $19.99. Free shipping with a $35 order or free 2-day shipping with Amazon Prime.

• Discover the wonders of flight
• Experiments include piloting your very own helicopter, race a rocket, take flight lessons from a bubble and more
• Includes 10 small straws, 8 rubber bands, 6 balloons, 4 sheets of paper, 2 binder clips, 2 large straws, bottle stopper, bubble wand and fishing line
• Also includes funnel, glider assembly, ping pong ball, plastic bullet, plastic tubing, ripcord helicopter assembly, target and an activity guide
• Recommended for children 9 years of age and older