Amazon offers the Unlocked Sony Xperia M4 Aqua 16GB GSM/LTE Android Smartphone in Black, model no. E2306, for $149.99 with free shipping. That's tied with our mention from a week ago and the lowest total price we've seen. (It's also a current price low by $50.) This waterproof phone features 1.5GHz ARM Cortex A53 quad-core and 1GHz ARM Cortex A53 quad-core processors (Qualcomm Snapdragon 615 8-core), a 5" 1280x720 IPS LCD, 2GB RAM, 16GB storage, 13-megapixel rear camera, 5-megapixel front camera, 802.11n wireless, Bluetooth 4.1, and Android 5.0 (Lollipop).