I would recommend getting the tinesup. You can get the universal adapter then just buy a new case when you switch phones. The case is pretty cheap. I tried this along with Novagrade and a cheap amazon one. Tinesup by far worked the best for me.
If you still prefer one time purchase, I also have this cheap one off amazon:
Amazon.com : Gosky Spotting Scope Phone Camera Adapter - Big Type Telescope Camera Adapter, Cell Phone Digiscoping Mount for Spotting Scope Binoculars Monocular, Fit Almost All Brands Smartphones : Camera & Photo
www.amazon.com
It isn't as well made as the tinesup or novagrade. I don't like it as much as the tinesup, but it worked better for being able to get the phone lined up for me than the novagrade did.
The novagrade was very solid/well built, but I just found it difficult to get the phone lined up right as compared with the others.