butterfly edufields 100+ stem projects | girls mini engineering kit for ages 8 10 12 15 years | ultimate diy science experiments for kids | educational engineering toys best birthday gift idea 1.girls engineering kit is up for auction in Toys & Games. The current bid is $1.00, 97% below the $39.97 MSRP, in As Is condition. This auction has ended — similar items appear in live auctions regularly.