You should reserve a rental car anyway. It is no obligation and no penalty if you don't show up. Rates last I checked started at $100 per day for an economy car. Good luck with you booster. Those open appts at CVS and Walgreens should be showing up around 1-2 weeks prior which will go quickly prior to Sept 20 if that is the route you are going.
I get mine through work (a hospital) so they said we are covered!
Do I rent through Florida? You guys, I've never rented a car.