We used undercover tourist a few years ago, you then choose whether you want to include water parks and park hopping on to the tickets or just entry to the 4 theme parks but beware if you don't pay for park hopping you will only be able to enter 1 park per day.
With undercover tourist, a 2 days non hopper is at $205 and a hopper $257
direct with Disney US a 2 days non hopper $200 and a hopper $252
you can get them for $204 if you use the mousesavers newsletter's undercover tourst link (sorry no posting that link, you'll need to subscribe to the newsletter) but the savings is minimal for a 2 days ticket.
It's only really worth it beginning with a 3 days ticket.