I am travelling in 3 weeks and have not yet decided whether to use DME or book a towncar. Disney does not mail the DME details to the UK (we have to sort it out at the desk) so I don't have to worry about the package not arriving in time, but I was wondering if there is a cutoff date for booking DME like there is for the dining plan. I know you can't just turn up at the airport desk, you have to book it in advance. But how far in advance?