Hey there Kaleb, welcome to planDisney, we're so glad you're here!
There isn't a great way to know if a desired merchandise or souvenir item will be available, especially if it's a very popular item. However, I do have a few recommendations!
My first recommendation is to check the
Disney Store site. They often have popular merchandise items, including ones that you can find in the theme parks!
My second suggestion is to make shopping a priority on the first day of your visit. We actually do not visit a theme park on our arrival day, we prefer to visit
Disney Springs for shopping, or relax at our hotel. The
World of Disney store at Disney Springs has such a huge selection of apparel and souvenirs, and if you do see the item you've had your eye on, I recommend buying it right then and there! I've made the mistake of waiting until later in my trip, and then the item is sold out.
I also recommend visiting the shops at the
Disney Resorts Collection Hotels. I've actually had great luck finding a sweatshirt in my size during my last visit that I couldn't seem to find at the parks! Some of my favorite shops are
Fantasia at Disney's Contemporary Resort, and Screen Door General Store at
Disney's BoardWalk.
I hope you're able to find what you're looking for this fall, Kaleb! If we can help with anything else as you plan your trip,
please come back and ask!
Have a magical day,
Melissa