Discovery Polymer Lab $25
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The Discovery Channel Store has this Discovery Polymer Lab priced at just $29.99, before $5 off $25 coupon code lowers it to $24.99. The lab uses powder, liquids, and air pressure to create hard, soft, stretchy, or slimy polymers. Shipping starts at $7.95 and there's no tax (except CA, MA, MD, TN). (Instructions »)