Lesley,
I just booked our trip today!
I'm not sure what site you are using to look at the prices, I used the good advise here and check many of the different countries websites to see which price would be better. I was amazed that I was able to get the deal shown on the French site for considerable less then the US site. There are 4 of us traveling together two adults and two kids (13, 15) we are arriving on a Friday and leaving on a Sunday. I selected a Golden Forest Room, half board and express train luggage service. On the French site it's $1317 euros ($1612) and on the US site it's $2220!
To do this research look for your days and select all the options that you would like in the language you know. Then when you do it on the other website you will know which options to pick (also google translate was my friend).
Once I figured out what I wanted I called 407-934-7639 as soon as the recorded choices start say
Disneyland Paris. Then you get transfer to the UK call center. You tell them that you want to reserve a france deal and you get transferred again. The reservationist that I spoke with was so lovely and helpful. By calling for your reservation you only have to paid 15% deposit and then the balance 30 days before arrival. If you book on the web you pay in full.
Have a fantastic trip!
Lois