Explorabook A Kids' Science Museum in a Book, $21.95

The Best Paper Airplanes You'll Ever Fly A Klutz Guide, $4.95

Castle A fold-out kingdom, $16.95

Backyard Stars A Klutz Guide for Home and the Road, $4.95

Battery Science Make Widgets That Work and Gadgets That Go, $21.95

Mother Nature Goes Nuts! Amazing Natural Disasters, $16.95

Magnetic Magic, $12.95

Building Cards How to Build Pirate Ships - extra cards, $14.95

Building Cards How to Build Spaceships - extra cards, $14.95

Building Cards How to Build Castles - extra cards, $14.95

Building Cards Hogwarts School of Witchcraft and Wizardry - extra set of cards, $14.95

The Klutz Book of Paper Airplanes - extra paper, $5.95

LEGO Crazy Action Contraptions - extra bricks, $12.95

Building Cards How to Build Castles - extra deck of cards, $7.95

The Solar Car Book - extra solar cell, $5.95

The Klutz Book of Paper Airplanes, $16.95

The Solar Car Book, $21.95

Building Cards Hogwarts School of Witchcraft and Wizardry, $19.95

LEGO Crazy Action Contraptions, $21.95

Building Cards How to Build Pirate Ships, $14.95

Tricky Video, $19.95

Kids Cooking A Very Slightly Messy Manual, $14.95

Building Cards How to Build Spaceships, $14.95

Invasion of the Bristlebots, $19.95

Building Cards How to Build Castles, $14.95