Where on earth do you find the Boomslang skin for Snape. I have looked..

You get the boomslang skin in his office. Go up to the picture of the snake and press A

In the office of snape

If you want to find the Boomslang Skin, first go outside Hogwarts. When you are outside, walk south in a straight line following the dark brown ground. Stop walking when you reach the 1st four trees that are place equidistant to each other(to find these trees, you must walk left and check if you are aline with the entrance gate of Hagrid's Hut). If you are now on the trees that I have said, put yourself in the center of the four trees then walk south (12 steps). Walk south a little bit (12 steps) and walk to your right and you must see a plant that is something similar to a tall grass that possesses the color yellow-green or something related to green. Go infront of it and press A and you will receive a Boomslang Skin(you can collect Boomslang Skins as many as you want but to do that you must hit Start+B+A and receive another Boomslang Skin).Good luck!!! Happy Hunting!!! ^-^