Thomas,
I have a lens shade for my Yashicia TLR, made by Yashicia and it works really well. I also have an off brand for the same cameras and it isn't worth owning... Doesn't fit well and isn't tight once it is fitted to the lens.
Watch E-Bay there are shades up for bid almost weekly and the going price is about $30. I got lucky and bought a Yashica 124G for $47. and the person threw in the Yashica lens shade... That won't happen again.
Anyway good luck