Retail Price $100.00 

Ready to use of the box, no installation required.
Uses active noise and echo reduction mechanisms to give you a crisp voice quality.
Works with almost all bluetooth enable cell phones.

 
http://www.cellxpo.com/itemdetail.asp?shopby=category&brand=ALL&model=ALL&cat=Bluetooth+Car+Kit&itemno=T305
 

I have used this speaker phone before and it's really easy to use.
But I've got one issue with it.  The speaker isn't loud enough when you're driving on the freeway. Even with the windows up, I had to strain to hear the other person....

If you're planning to use it while driving in town, it should work really well.