I agree with PP and Undercover IF a Disney package isn't a better deal. I always compare package versus room only and tix. Most often, it has been room only (with a discount) and then I purchase from Undercover.
One time once already at Disney, I decided to add a night at Pleasure Island, and it was worth my while moneywise to drive to their store to pick up tix versus buying directly from Disney. Very close driving location to Downtown Disney. Sales clerk was very friendly and I was pleased with my decision.