Yes. They sell them online, and any Publix or CVS down here sells them.

Pro-tip: the SunPass Mini stickers are $5, come with $5 worth of tolls, and contrary to what the manual says, they work just fine if you tape it or hold it up to the windshield.

Be sure you register the car's tags with your SunPass account, even for a rental (you can give it a start/top date and time for rentals). This way if the pass doesn't read, they can look up your account instead of mailing you a ticket.