Boost Mobile offers the refurbished Kyocera Hydro Waterproof 3G Android Smartphone for Boost Mobile in Black, model no. C5170, for $14.99 with free shipping. That's tied with last week's mention of a refurb and $19 under the lowest total price we could find for a new unit today. (However, we saw it new for $5 less in March.) This phone is purported to be waterproof in three feet of water for up to 30 minutes and features a 3.5" HVGA IPS touchscreen, 1GHz single-core processor, microSD card slot (2GB microSD card included), 3.2-megapixel rear-facing camera, Bluetooth, GPS, and Android 4.0 Ice Cream Sandwich OS.
Note: Although Boost Mobile describes this phone as having a dual-core processor, it is actually a single-core CPU. No warranty is provided, but Boost Mobile does offer a 14-day satisfaction guarantee.