Hi! It looks like it's weathered barn wood - reclaimed. I recommend simply Googling "reclaimed wood" and the name of your city to try and find it in your area.
The three panel door style is common. They are custom sized for your space. Here they have a very square look, because of the proportions. The chrome lever handles are getting very popular now.
These are solid core "paint grade" interior doors and come in many designs. You can see the different solid core interior door designs here http://www.decodesigncenter.com/products/interior-doors/solid-core/
