Walmart offers the LEGO City Great Vehicles Ambulance Helicopter Kit for $15.99. (Amazon charges the same with free shipping via Prime, as does Target via pickup.) Opt for in-store pickup to avoid a $5.99 shipping fee. That's tied with last month's mention and the lowest price we could find by $4, outside of the deal below. It includes 190 pieces.

A close price: Toys"R"Us charges $16.79 via in-store pickup.