As the other poster mentioned, you can find everything that is sold in the parks, in DD - and then some! However, if you have a free day, you might also want to tour some of the resorts and the resort gift shops. Animal Kingdom has some very unique items in their gift shop. I always find something there that I want, that is not sold elsewhere on WDW property! A trip around the monorail resorts is fun too - make a PS for breakfast, lunch or dinner, tour the resort and visit the shops too.