There are three outlet malls in the tourist area.Prime Outlets which are located at the north end of International Drive,Orlando Premium Outlets which is on Vineland ave. close to Sea World and in the southern end of International Drive and the Lake Buena Vista outlets which are on 535 south of I-4.The Lake Buena Vista outlets are the smallest so I would skip them.Prime and Premium are pretty similar in the stores they have and size,Prime might be a bit bigger but they're both still big.If you're taking a cab I would avoid Prime as it's the furthest one away,I would go to Premium which is maybe a 5-10 minute drive from Downtown Disney.So what I would do is take the Disney bus to Downtown Disney and take a cab to the Orlando Premium outlets on Vineland avenue to save on cab fare.