How many people in your party? Adults or children?
There are 4 partner hotels very close to DLP which are served by a shuttle bus and where you can sometimes get good deals. - Explorers, Kyriad, Magic Circus and Dream castle. Kyriad and Explorers tend to be the cheapest. Have a look at Expedia or book direct rather than with DLP as then it shouldn't include tickets which you won't need.
These 4 hotels are not at Val d'Europe as stated above.
As well as these there are several other cheaper hotels near Val d'Europe, Bussy St George. Again google expedia - some are very very basic and budget and some are good enough for a longer stay if needed. Ive never stayed at any there but Im sure other posters will give you suggestions - they are one or 2 stops away from DLP on the RER (Commuter train)
As for getting from the airport you could get the TGV (High speed train ), arrange a private shuttle, get the Magic Shuttle or get the RER (commuter train).
The RER is the cheapest but the slowest and you will have to change trains in central Paris (same station- different line)
The TGV is the fastest but you have to get from your terminal at the airport to the station (there are shuttles) and then get from the station at DLP to your hotel.
A private shuttle often works out the easiest and depending how many of you there are it can often be the same price - it will take approx an hour but will collect you at your terminal and drop you at your hotel so no messing around with shuttle buses or cabs.
Most people recommend and use either RS Transports or Ezyshuttle.
This thread from the useful info sticky will give you more info about getting from the airport
http://www.disboards.com/threads/travelling-to-dlp-by-plane.1004423/