LOL, sounds like a quick repair job you want to do in the autozone parking lot - trying differerent size belts until you find the right one.

But what are the other accessories driven by the A/C belt and can they be adjusted for belt tension? If its just the power steering pump then you have the option of driving the car to autozone in manual steering mode with the A/C unit pulled.

Or run a string across the pulleys without A/C that you want to use to keep the car drivable. Then measure the string and get a belt the same approximate length.