As inferior as SlimeVR sounds, I think it's more bang for your buck if you get like 10 of 'em and be able to move more parts of your body for around the same price as getting just 3 Vive trackers. Worse tracking quality and prone to resetting, but still. I for one would love to actually shrug in my geimus, but that's just me.
I wonder if you can mix-and-match different tracker brands/types and still have everything work?