Rain X alternative

[washnshine]

1300 cars equates to about 30 cents an application. I'd like to hear comperable cost per application Rain X #s

15 gallons of Rain X is $800. I am applying it closer to 1 oz. per vehicle, so that is 42 cents per application for me (1900 cars). This amount does do the trick with this product - I'm not going light on the application.