Samsung Galaxy J3... not a flagship phone, but I bought it and sold it for around $50 ... another example could be the LG X-charge that was sold by Comcast for

Samsung Galaxy J3... not a flagship phone, but I bought it and sold it for around $50 ... another example could be the LG X-charge that was sold by Comcast for $0.01 last year on sale (no contract) and it is $180 now