eBay has the Unlocked Apple iPhone 6 Plus 16GB 4G LTE GSM Smartphone (several colors) refurbished for $200 with free shipping. Features 3G Data Capable, 4G Data Capable, Bluetooth Enabled, Fingerprint Sensor, Global Ready, GPS, Internet Browser, Music Player, Speakerphone, Touchscreen, TTY Compatible, Voice-Activated Dialing, Wi-Fi Capable.
eBay has the Apple iPhone 6s 16GB GSM Unlocked Smartphone (MKRX2LL/A rose gold, silver, or space gray) refurbished for $190 with free shipping. Features 4.7" Retina HD display w/ 3D touch, A9 chip, 12MP iSight camera, 4K video (2160p), 802.11a/b/g/n/ac with MIMO, BT 4.2, iCloud, iOS 9.
Has good Amazon Reviews.
eBay has the Google Pixel XL 32GB Verizon No-Contract 5.5" Smartphone (Quite Black or Very Silver) refurbished for $273 with free shipping. Retail price: $769. Features Snapdragon 821 Quad-core 2.15GHz, 4GB RAM, 32GB storage, 5.5" AMOLED 1080p display, 4G LTE, 12.3MP cam, Google Assistant voice control, Android 7.1 Nougat.
eBay has the Samsung Galaxy S8 Dual SIM Unlocked 64GB 5.8" Smartphone, 2017 model (Black or Silver) for $560 with free shipping. Features Exynos 8895 Octa-Core (4x2.3 GHz & 4x1.7 GHz), 4GB RAM, 64GB storage, 5.8" Infinity display (2960 x 1440), 12MP cam, 802.11ac, Android 7.0 Nougat.