Samsung's Galaxy S7 is currently on sale over at eBay. The T-Mobile variant which is unlocked, is available for just $209. This is a refurbished model, so it is not brand new, but it will work with other GSM carriers like AT&T and MVNO's like Straight Talk and Simple Mobile.
The Galaxy S7 is Samsung's flagship from last year. It sported a 5.2-inch Quad HD Super AMOLED display, powered by the Qualcomm Snapdragon 820 processor along with 4GB of RAM and 32GB of storage. Samsung has included a 12-megapixel camera on the back of the Galaxy S7 which can take some pretty fantastic photos, and was rated as one of the best cameras available, when it launched. While cameras have gotten better since then, the Galaxy S7 is still one of the best, as far as cameras go. There is also a 3000mAh battery inside, which is non-removable, but it should keep you going all day long. At the time of writing this, eBay only has the Galaxy S7 available in black or gold, the other colors are already sold out. So you'll want to jump on this quickly.
eBay is not collecting taxes on the Galaxy S7, and the seller is offering up free expedited shipping. So this is definitely a good choice if you need a new phone quickly for a good price.
UPDATE: The phone now costs $239.99.