There are cheaper options but you have to really dig for the deals.
You can rent DVC points from an owner or thru one of many websites that work as a go-between for you and the owner. Sometimes distressed points (about to expire soon) can sell for as low as $6/pt.
There are some travel websites that book blocks of rooms at the deluxe resorts and then sell the rooms at a discount to their customers.
If you are a member of a professional organization, specific interest group or your children participate in an organized sport with national affiliations, you can look for their annual meetings which are sometimes in the Orlando area. Rooms can be deeply discounted.
If you have a friend or relative who is a cast member, they might be nice enough to book a room for you using their discount. Yes, they are allowed to do this and no, they do not have to be staying with you. They only have to meet up with you to do check in.
There are discounted tickets available thru outlets like Undercovertourist and Mapleleaftickets. Less than what Disney charges at the gate or in their packages.
So yes, you can do it for less than Disney charges on their website...sometimes.