Hi Duff,
The best place in my opinion is buying them in the US, we use
www.mapleleaftickets.com in Kissimmee and actually visited their shop on the 192 in August last year (seems strange saying 'last year').
They issue tickets not vouchers, and at discounted prices and post to the UK for a very small fee.
The Magic Your Way tickets are brilliant, we wanted passes that gave us the hopper facility and that never expire, mainly because we are regular visitors but do not visit WDW every day so our passes will last us a few holidays.
We have the 10 day Premium passes which also give 5 days at water parks/disney quest.
These passes are ideal for us but maybe not for you, it just depends on what you are looking for really.
You may be able to find them slightly cheaper if you shop around, however , mapleleaf have always been good for us so there is no reason for change.
Especially when we are now covered for at least 3 holidays (we have APs for Universal).
I am sure you will get plenty of different opinions but we will always stick with our personal choice.
