It's a Topeak Ride Case. Here's a link to the one for the iPhone 5:
http://amzn.com/B00B139YUW
I just purchased it after seeing that post as well. The one in the picture in the link looks slightly different than the one I got, though. The only difference is that the case that goes on the phone goes all the way around, whereas, in the picture, it shows the silver sides of the phone.
It's a pretty good mount though.
The only problem I had with it was the hole for the headphone jack is tiny. I had to file the hole to make it bigger to fit my headphones in it and they rubbery part around the jack is one of the smallest I have seen. I even went to Radio Shack to get an adapter and they were all too big.
You can get a file for like $5 at the hardware store (if you don't already have one) and make it bigger, though.
thank you so much, I'm definitely going to purchase that case and the mount in the future, I would really like to have my phone on the mount instead of in my pocket while I ride