Boost Mobile offers the refurbished BlackBerry Curve 9310 No-Contract Smartphone for Boost Mobile for $14.99 with free shipping. That's the lowest total price we could find for a used model by $21. (It's also $65 below the best price we could find for a new one.) Features include a 2.4" display, 512MB memory, microSD slot, 3.2-megapixel camera, 3G connectivity, 802.11n wireless, Bluetooth, and BlackBerry 7 OS.

Note: No warranty is provided, but Boost Mobile does offer a 14-day satisfaction guarantee and the phone is eligible for insurance if added within 30 days of purchase.