Would recommend checking the Walmart app for inventory details and the item's price/description/location, if they have it, especially since that may be considered a seasonal item. Some items aren't available in-store, but can be ordered for delivery to the store (with a free ship-to-store option available, usually) or to your own address. Best of hopes!
Nope sorry
Deffinitely not the costume itself no. You should try to re-create it by researching. This would be a great store to purchase most of the materials and accessories you may need. You may also want to look into some of the party/costume stores once you have a good idea of what you will need in order to create the costume.
Probably not. You can get stuff to make it but I doubt you'll find the costume in store
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