Best Buy has the Hot Wheels AI extra car+controller on clearance for $25 plus free shipping.
Yes, this isn't the best price ever - the whole system was sold for cheaper a few months ago - but for some reason just the car/controller combos are always obscenely priced - $40+ on Amazon.
If you're lucky like me and have a kid whose birthday falls a few days before Thanksgiving, deals like this will do.
Just sharing in case anyone else is in the same boat.
If you're really lucky you may find open box in stock near you at $20.99.