Hi Shelly,
Welcome to the Disney Parks Moms Panel, and thank you for this quack-tastic question. I'm totally with your husband – Donald Duck is #1 - and he'll make sure to remind you of that fact!
I have definitely seen Donald Duck hats around Walt Disney World, and I'm sure you'll be able to find Donald merchandise on your upcoming visit. I recommend stopping at The Chapeau in Magic Kingdom Park, as they have a huge variety of hats and headbands. The Chapeau is connected to The Confectionery on Main Street, U.S.A, so be sure to stop in for a sweet treat. Another great option is The Emporium, which is located just across the street. A Cast Member in any merchandise location can search their system to locate a hat for you, too.
If you want to have a hat before your vacation, I did a quick internet search and found some cute ones on Amazon.
ShopDisney has a good selection of Donald-related merchandise, though I don’t see hats at the moment.
Your husband won’t want to miss
Donald's Dino-Bash in Disney's Animal Kingdom. Donald is in the cutest dinosaur costume, and he's invited his friends to a super fun prehistoric party! There are lots of great characters to meet (we recently met several DuckTales characters) and an evening dance party. Make sure he wears his hat, as Donald LOVES seeing himself on t-shirts, hats, and buttons!
Meeting Donald Duck is amazing no matter where you find him, but my current favorite place for a picture and Donald hug is at
Pete’s Silly Sideshow in Magic Kingdom Park. He and Goofy had me and my pals laughing so hard on our last visit!
Wishing you a magical vacation,
Robyn