National Geographic Mega Slime Kit & Putty Lab - 4 Types of Slime Plus 4 Types of Putty Including Magnetic Putty, Slime Kit for Boys and Girls, Sensory Putty Toy & Science Kit (Amazon Exclusive) is up for auction in Toys & Games. The current bid is $11.56, 61% below the $29.99 MSRP, in Good Condition. This auction has ended — similar items appear in live auctions regularly.