The cheapest way to buy a new or used iPhone XS, Max or XR! This is a review of the website Swappa (swappa.com) where you can buy second-hand iPhones at a massive discount. On Swappa all phones must be whitelisted and not iCloud locked. You also pay with Paypal for added safety.
I purchased a mint condition iPhone XS Max for 30% off MSRP and after using it for 2 months I can honestly say that it was brand new. It even has 2 years of Apple Care!