[05/14/2018] 7TECH 245 PCS 4-in-1 Model Building STEM 益智組合玩具，7TECH 245 PCS 4-in-1 Model Building STEM Educational Construction Engineering Toy with 3 Cars ＆ Helicopters Airplane for Kids，可以組裝成四種造型，全新，目前特價$13.49 USD。Prime境內免運費 (學生可以免費試用Prime)。哪裡買: 7TECH MALL via amazon。