OnePlus isn't a very well know brand, but they just announced their second phone ever, the OnePlus 2, and that means the original from last year has been discounted permanently to $299. Alternatively, the 2014 Moto X has also been lowered to $299.
The OnePlus One is one of the best phones from this list, and is only $299. It has a 5.5-inch 1080p HD display, a more powerful Snapdragon 801 quad-core processor with 3GB of RAM, a 13 megapixel Sony camera, 4G LTE, and a large 3,100 mAh battery. All of this costs you just $249. There's also a 64GB model available if you have the extra cash. The 16GB $249 model is no longer in stock but available outside of the OnePlus store, otherwise get the 64GB model for $299 and enjoy all it has to offer.