Just a note. The closer you get to the belly the more stretch you will get. For belts and holders, I like to stick with the upper portion of the hide, towards the back. Shoulders are okay for me. I have seen a lot of stretch marks aroudn the shoulder. But then again, I like these characteristics, especially, when they are finished. It adds a nice texture.
I have bought my hides from Stevenson Paxton at $99 a side and I have yet to be dissatisfied with S&P leather in Corona, CA.
Now, I have also bought some of Springfield Leather (special listed in the banner above) Hermann Oak, cost a bit more, but great customer service.
Good luck