Amazon offers Prime members the K'Nex SuperSonic Swirl Building Set for $12.18 with free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, it adds $6.53.) That's tied with our mention from last week as the lowest price we've seen. (It's also a current low by $5, although most stores charge closer to $30.) This 464-piece set includes a motor and figure.

Note, this item will not be in-stock until December 24.