Amazon Deals: K’NEX 375 Piece Deluxe Building Set Only $9.99 (reg. $19.99) 50% OFF!November 5, 2014 by SMFM Leave a CommentOnly $9.99(reg.$20.00)Amazon has this K’NEX 375 Piece Deluxe Building Set on sale for only $9.99 (reg. $19.99) and shipping is FREE via Amazon Prime or on orders over $35.Get this Deal Here!