Thames & Kosmos Crystal Growing Science Kit Grow Over A Dozen Crystals with 15 Experiments, Includes Storage Case & 32 Page Color Laboratory Manual Price:  $24.87 (as of 31/12/2019 15:34 PST- Details)

Learn about the structure and geometry of crystals
Grow dozens of dazzling crystals
Mold fun plaster shapes and use dyes to grow a rainbow of custom colors