Your kids will enjoy their summer outdoors with this Banzai Twin Falls Lagoon now just $629.99 (reg. $699.99) at Kohl’s. You save 10% off the retail price for this backyard waterpark. Plus, you will receive $125 Kohl’s Cash (to use May 26-31) and free shipping. We could not find a lower price for this waterslide online. The Banzai Twin Falls Lagoon features two curved water slides, splash pool, overhead sprinkler, and water cannons. Sales tax is charged in most states. Deal may expire soon.