LEGO DUPLO Cars Agent Mater 5817 is only $11.99 on Amazon right now!
It will ship free with Prime or Super Saver Shipping.
My son has this set and he LOVES it. He actually loves all of the DUPLO Cars sets and is very fond of Mater, Fillmore and McQueen, but he especially likes the cannon on this set. He's only 18 months old, but he has figured out how to load and shoot it!