Amazon has a great sale on the Samsung Galaxy S8 and S8+, both unlocked and less than $600 | Mashable
Amazon.com: DEFBSC Case Compatible with Samsung Galaxy S8 Plus Case, Marble Case with Ring Kickstand, Marble Design 360 Degree Rotating Ring Kickstand Soft TPU Shockproof Case Cover 6.2 Inch, Blue : Cell
Galaxy S8 Plus Case Clear Cute Gradient Shockproof Bumper Protective Cell Phone Case for Samsung Galaxy
Amazon.com: Samsung Galaxy S8 64GB Unlocked Phone - US Version (Orchid Gray) : Cell Phones & Accessories