Hello Whitney!
Sounds like our girls have the same interests! I'm pretty sure I have all the lyrics memorized to "What's My Name?" Last Halloween our family of 7 all dressed up like characters from Descendants 2 and you could hardly find an Uma, Mal, or Evie costume in stock around Disney Parks. However, since then I haven't been able to find much on Descendants merchandise.
I did a quick search in the
Shop Disney Parks app, and I only found the DVD and CD in stores at Epcot in
Mouse Gear and
Celebrity 5 & 10 in Disney's Hollywood Studios. I did not find any Zombies merchandise, but that Disney movie is fairly new, so maybe there will be merchandise in the future. My girls are huge fans of that one, too.
If you download the Disney Parks app, you can search for items, and the app will tell you where in the parks it is located. Once you click on the product, use the map feature and it will tell you in what store in Walt Disney World Resort you can find it. Also, Cast Members in the retail shops will be happy to assist you, too.
Also, with the announcement of Descendants 3 next summer, hopefully we'll see even more merchandise for our Descendants fans!
If you have any other questions, please come back and see us real soon. Have a magical vacation!
Tania