40 dollars for 2 tires, maybe 60 with tubes. Another 20 for a new drive belt. A can of carb cleaner and maybe a gallon bucket of Dip will add another $65 to the tab, unless Pipples Republik of Kalifornia levies a Green Tax on Highly Toxic Hydrocarbon Solvents.

Beyond that, a license plate, spark plug, gas and oil. I doubt you get to $400.