I sent the mfg the question about the cost and availability and about the iPhone 3GS capability.
Thank your for your email inquiring where to purchase the Sonic Clamp AXE-S.
To answer your question, we are currently in the process of making the Clamp available for purchase via our website www.sonicclamp.com. We will also be available in small retail shops around the U.S, but for convenience's sake, online would be your best option for purchase. The MSRP for the Clamp is $49.95.
Also, regarding the iPhone holder for the 3GS, we are currently working with our manufacturers to produce a holder for that iPhone model. It should be available within 6-8 weeks. Our packaged Clamp comes with the iPhone 4 holder and the 3GS would need to be purchased separately for a nominal price. Hope this answers your question!