Mouseketrips is the parent company of MouseBuzz, by the way –
Because Mouseketrips specializes in Disney travel, they may have opportunities that other TAs, including AAA, don’t have. Different TAs do seem to have different options.
We have traveled both ways – putting the pieces together ourselves, and using a TA. We have had a TA put together a great-priced package, and we have had a TA put together a package for us that was out of control expensive. You have to compare TAs, the deals you can get and then invest in the option that saves you money.
If you have discount codes through work, or special hotel memberships, etc., or if you have time to really scout all the deals out there, you might be able to put it all together for a great price yourself.