When Florida changed their laws a few years ago to not let UK/Euro Blue badges be used Osceola County tax office kindly stepped in and offered a purchase in advance option and posted the permit to you ahead of your trip. As of last month that service has been stopped and the best offer for a permit is to make an appointment at their main office. I believe Disney and Universal parks still accept the Blue Badges but am not sure about resorts.

It was so nice going to California last year and just being able to use the Blue badge as it was. Wish I understood why Florida makes life so difficult!