There are some blinder's that are similar to masks. They only have a small yellow slit behind a silver faceplate. I usually find one on the surface base on Telos. However, it is not an actual mask, just remember that.
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I think there are sith masks too, but in my opinion they are not very good and don't look particularly good either. I prefer the blinders that hill-shatar mentioned. there are quite a few of them, they all look the same but there are different types that do different stuff.
And Nihilus also has a mask that you can ask Visas' to get after you defeat the Sith Lord himself. It's suppose to increase your connection to the Force I think....probably an increase to the maximum Force Points.
getting the mask gives you an one off increase to your force points and ds points but i don't think you can actually wear it - at least i couldn't get my ds character to wear it
Thinking through, I can't think of any of the masks or blinders that are found at fixed locations (after Peragus, very few things are, except quest items, the twin suns' blades and the swag in the Onderon Palace Museum AFAIK)
