This looks like it's spot onOriginally Posted by Tink, post: 273222
The recommended transponder is $25 called the sunpass portable (there seems to be a mini stick on for $4.99 but I guess theyre saying that wont come off so easy).
Then you can top the account up even using cash! now since you can buy the transponders over the counter and top up with cash, that would seem to get over the obstacle that most of these things have for UK visitors (credit card not registered to a US address)
obviously $25 pays for a fair few tolls but worth it I think if either you fancy the rental car company's scheme or go out there a lot and pay a lot of tolls.