They had a wide selection of Disney character stuff, better than a lot of the specialty places. I didn't see costumes, but they may very well have some.
They do children's Disney tee shirts, so they should do costumes too. Maybe do online too
If they don't, you will likely find those at many gift / souvenirs stores nearby..good luck 😀
Yes, all Orlando Walmarts have, try the ones far from Disney and will get best prices
Yes I have seen costumes by Disney at stores.
I just see character t-shirts and suveniers
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