Newegg has Samsung HKT450 Bluetooth Car Kit - Retail for $19.99 + free shipping.
This HKT450 Speakerphone from Samsung improves your on-the-road audio experience, and can be optimized for your car. With Bluetooth v2.0 and A2DP streaming supported, you can either use it as a hands-free speakerphone, or as a portable-stereo speaker to enjoy the music. It can give you up to 8 hours of talk time (up to 325 hours of standby time) and comes with a car adapter to recharge it. Simply clips to your sun visor, so there's no complicated installation and moving it to another car is a breeze!
It also cheerfully pairs up with your Bluetooth enabled music player, for a wireless stereo audio enjoyment. With the multifunction button, you can answer, end and reject calls. You can even dial the phone number by voice (need phone supports) and keep your eyes on the road for safety.
Measuring 5.23 inches long by 1.94 inches wide by 0.6 inch thick, and weight only 2.85 ounces; you could carry this compact unit around with ease.
Samsung HKT450 Bluetooth Car Kit - Retail $19.99 FS 
