Has anyone tried the braketron cup holder mounts?
Amazon.com: Bracketron UCH-101-BL Universal Cup-iT Cup Holder Mount: Electronics
Looks like it might block access to the volume buttons.
I used my Bracketron before I got the Verizon one. Works fine. You need to work a little on positioning the left bracket so that you can plug the phone in but not have it hit the volume keys, but it works well.
Alan