Penguin Pools offer you the best in Oasis Vinyl Liner Pricing in Southeastern Wisconsin. The Oasis inground swimming pool design is a unique pool shape; we take an oval pool and then push the middle out. These pools are very popular when Penguin Pools installs spill over spas, as the spa fits nicely in the middle of the pool. We offer a variety of Oasis pool dimensions for you to choose from, and customization is always encouraged.