Best Buy via eBay offers the Pioneer 6.2" Bluetooth In-Dash CD/DVD/DM Car Audio Receiver, model no. AVH-X391BHS, for $199.99 with free shipping. (Amazon charges the same, although it is temporarily out of stock.) That's the lowest price we could find by $100. It can connect with up to two smartphones and features a 6.2" color touchscreen, four 5-watt channels, 24 AM/FM presets, HD Radio tuner, satellite radio support, and USB input.

Need it installed? You can order via Best Buy direct to get free Geek Squad Installation. (It's an additional savings of $100, although additional fees may apply for some vehicles.)