Looking for an iphone bluetooth adapter

[slopson]

I currently have a Yamaha home theater setup that has an iPod/iPhone dock. Problem is its the 30pin adapter. I don't own an iPod and usually just use my iPhone. Ive seen some Bluetooth 30pin adapters and was curious if you guys have used any and what is the best one to buy? Yamaha makes one for the dock but its retail is over $100 and im not looking to spend that much

so to sum it up

What is a good bluetooth adapter for a 30pin dock?

Heres an example of what im talking about

Amazon.com: CoolStream Bluetooth Receiver for iDock Speakers (Home or Car). Turns iPhone/iPod docking station into a Bluetooth dock.: MP3 Players & Accessories