Amazon offers its Prime members the Tinkertoy 100-Piece Essentials Value Set, model no. 56043, for $27.49 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it costs an extra $6.57.) That's the lowest total price we could find by $5. The set includes spools, rods, flags, washers, end caps, and more.