Great question — answering as the UphillTech team:
If you search the web, you might be able to find deals up to 50% discount for Eurodisney. Usually, you will have to opt for a specific date. Sometimes, the deal is reserved to the local people but not always. You can search websites like ticketmaster .
Full answer by Laurent: https://travel.stackexchange.com/a/71303 (CC BY-SA 3.0).
Need it done for your business? UphillTech.