Walmart offers the K'Nex Revvin' Race Car 2-In-1 Building Set for $18.74. (Amazon charges the same with free Prime shipping.) Opt for in-store pickup to dodge the $5.99 shipping charge. That's the lowest total price we could find by $6, although it was $4 less in November. The set includes over 370 pieces to build two cars. It requires two AA batteries (not included).
Walmart offers the Nerf N-Strike Elite Series 30 Dart Refill, model no. A0351.79, for $6.96. Opt for in-store pickup to dodge the $5.99 shipping charge. That's tied with our December mention and the lowest price we could find by $4. It includes 20 Elite darts and 10 Elite deco darts.