Amazon offers Prime members the K'Nex 70 Model 705-Piece Building Set, model no. 13419, for $12.32 with free shipping.(Non-Prime members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $7.16.) That's $6 under our mention from ten days ago and the lowest price we've seen. (It's a current low by $6.) It includes 705 K'Nex pieces and a treasure-chest storage case.