For pickup only, Walmart offers the LEGO City Arctic Snowmobile, model no. 60032, for $5.59. (Amazon charges the same with free shipping for Prime members.) Outside of the mention below, that's the lowest price we could find by a buck. It features one minifigure and a detachable sled.
A close price. Toys "R" Us charges $6.29 via in-store pickup.