Hi, Lynette!
With so many fun cups, mugs, popcorn buckets, and more, I am not really sure what mugs you might be looking for. I am guessing you might have seen some fun Halloween mug or other festive item. The best place to check for something like this will be a popcorn cart in the
Magic Kingdom. They usually have some fun and unique items, especially around Halloween or Christmas.
You will also sometimes find some different items (such as glow cups) during special events such at
Mickey's Not So Scary Halloween Party or
Mickey's Very Merry Christmas Party. Do some exploring, and if you see a guest with an item you want, ask them where they got it! Most guests are happy to share in their magical findings!
Once you are in any theme park or Disney Resort hotel, you will not be lacking for any shopping. At the gift shops you will find unique and magical gifts of all shapes, sizes, and prices. Hopefully you will find the perfect souvenir to take home from your vacation. Good luck!
Cathy