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Walmart.com offers the Banzai Cannonball Splash Backyard Inflatable Water Slide for $25. Even with $7.97, that's the lowest total price by $4. You can also select Site-to-Store shipping to pick it up for free at your local Walmart. It's 13 feet long with an 8-foot long splash pool at the end (which is included in the overall measurement). Sales tax is charged in most states.