Hi Jennifer! Welcome to the Disney Parks Moms Panel!
It makes me sad to report this as I had it high on my own itinerary for an upcoming trip, but the "Create Your Own Potato" and "Stuff a Box" station at Once Upon a Toy in Disney Springs has been removed for the time being. Hopefully Mr. Potato Head is just taking a nice, luxurious vacation somewhere warm and will come back soon. (But maybe not too warm, as he his a potato, and I don't want him to bake on the beach.)
Unfortunately that was the only location for this shopping experience at Walt Disney World Resort. You'll have no problem finding a regular Mr. Potato Head, along with Buzz, Woody, and the whole Roundup Gang at multiple locations around the world, including
World of Disney at Disney Springs and Toy Story Dept. across from the entrance of Toy Story Mania at Disney's Hollywood Studios. Or, if you're really wanting to build your own souvenir, there's always designing a dinosaur at T-Rex in Disney Springs, building your own lightsaber at
Tatooine Traders in Hollywood Studios, or new for 2018, you can find that perfect set of Minnie Ears with
interchangeable bows at shops all around Walt Disney World Resort.
I'm so sorry for your disappointment, Jennifer. I'm really going to cross some fingers that we see this wonderful souvenir station again soon. (Maybe even in Toy Story Land at Disney's Hollywood Studios???)
~Kristen