I have this very unit in my home. At Monoprice, it is listed as item# 2946, "3X1 Optical Audio Toslink Bi-Directional Manual Switch."
It cost $6.34.
It works quite nicely. I will say that you may want to label the inputs. I think most (including myself) will use only one of them frequently (for me it's the BD player) and may forget which one the other two inputs belong to.