There are two - the closest is the Orlando Premium Outlets on Vineland. There is a Character Warehouse and a bunch of other stores. There is a website - google "Orlando Premium Outlets" for a list of stores and sales. Whether it is worth it depends on what you are looking for and if you want to shop. We always rent a car so we make a quick stop just for the character outlet or if we forgot something but parking can be a nightmare.
The other is on I-drive some of the same stores - again, it depends on how much shopping you want to do whether it is worth it to you. I have outlets near me at home so I don't usually bother with more than just the Disney Outlet. It is very hit or miss.