Although these days it seems as though the toys that are being made leave a lot to be desired when it comes to sparking a child's imagination, it's good to know that there's at least one that will pass the test. And that's the K'NEX 521 Pc. Value Tub from Walmart . Today only, this must-have toy is half off, ringing in at only $10 as the Value of the Day. At that price it's affordable enough to purchase several, then sit back and watch the fun begin. Available at this price only on 12/17/2013.