Knowing I'd be on a milti-day road trip in Florida, I decided to find out about the SunPass program.

They actually sell the sticker type and transponders ($5) and the larger plastic transponders ($25?) at Publix (a grocery store there) and I think CVS Pharmacy, and other places. The sticker type passes state that they are one-time use. I bought the $5 sticker type and called up and got it activated. This was quite an involved activation, but, it was definitely worth it as we could bypass the toll booths and pay a reduced toll rate. The $5 was applied to your account as a credit, whereas the $25 regular plastic type, since it is interchangeable between different cars, is not "refunded" as a credit.

I was going to be renting two different cars in FL that trip, so I just stuck the sticker as lightly as possible on the window, in hopes that I could remove it for the next rental. It easily came off, and I just stuck it up on the windshield of the new car.

If you are not planning to return, you can call and have your remaining balance credited back to your card. If you are planning to return, you can just leave the balance in place and use it later.