The spin mops are at the back section near the paper towels and cleaning products.
Like Sarah mentioned, near pet food and cleaning in the back right, adjacent to grocery.
I'm not quite sure wear they are located.
If you have the Walmart app, select the store location, then there is a search option to enter the name of the item and it will let you know if it's in store and what aisle it's on. App is also handy for price checks.
Yes there are in the cleaning supplies section
Try aisle J10. Thats what the website says.
Thanks! Your answer is awaiting moderation.