Walmart offers the K'NEX 375-Piece Deluxe Value Tub, model no. 13597, for $11.98. Choose in-store pickup to avoid the $4.97 shipping charge. That's $6 under list and the lowest price we could find, although it was $2 less a month ago. This set includes 375 pieces and ideas to build 30 models, including a truck, helicopter, and dune buggy.