Someone has to pay for the "container" it was shipped in..?
Someone has to pay for the company to make out the address label and stick it on the package...?
Someone has to pay for the time involved to do all the above ( the actual LABOR charge)..?
Take your car into a dealership and have them "check the oil" and while they are under the hood...the coolant level; the windshield fluid and they might as well have a go at the battery water level. You can always toss in the tire inflation....and THEN pick yourself up off the ground when you get the bill for doing that!