DaVoice Tripod Adapter
This one falls under the cheap/generic category of tripod mounts, but if you're looking for something low cost, then the DaVoice tripod mount is for you.
It's only $7, making it a cheap buy, but it does the job well. It works almost exactly the same as the Joby GripTight, and it even has a wider base that can contribute to a more secure fit for your iPhone when it's on the tripod.
It even has a handy pull tab at the top, that allows you to extend the spring-loaded clip easily and slide in your iPhone without the risk of pinching your fingers during the process.
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