We've seen a fair number of these Bluetooth handsfree car kits, but even by Kinja Deals standards, $15 is really cheap. It even comes with a 3-port car charger, so you'll have two extra ports to charge phones. [SoundBot SB360 Bluetooth 4.0 Car Kit w/ 10W Dual Port 2.1A USB Charger + Magnetic Mounts, $15]
Just note that your car will need an AUX jack for this to work. If your car is really old, and you wanted to get hacky, you could plug the adapter into a cassette tape adapter to achieve the same effect.
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