I picked one up for 100$ as a backup to my Windows phone. Not a bad phone at all but the marketing was terrible.
I picked up a new one with Prime for $125. I flipped it and cleared about $83 in the sale, which means I got a year of Prime for $42. Plus, I had the chance to play with the phone. I was very impressed with the build quality, and after installing the Play Store and Google Launcher it was basically a normal Android phone.