Amazon offers its Prime members the Hot Wheels Monster Jam Front-Flip Takedown Playset for $9.99 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.80. Alternatively, Target has it for the same via pickup.) That's the lowest total price we could find by $10. It comes with a die-cast truck and three plastic trucks.

Update: The Amazon item is no longer available; however, Target still offers it for $9.99 with in-store pickup.