I have seen a unit called the Varavon Multifinder UNI but neither BH, Adorama carry this unit. https://www.youtube.com/watch?v=kRdOFzHENmQ
I have seen the Hoodman and its ok and the Zacuto Z Finder which is very expensive and a few other knock offs. The Varavon has the mirror for low down work, not sure how good it it though or the price.
Any recommendations on one would be great.