I had been looking into that at one time. Doughboy pools will give you complete instructions on how to do it without voiding the warranty and their pools can have a deep end up to 6 feet. www.hoffinger.com is the web address you need to get the contacts for the instructions. Your local Doughboy dealer may know how do it. Mine didn't.
Also check Champlain pools by Technican www.technican.ca
They are "onground" pools of inground quality. www.propools.com sells them online.