My USBC mouse is Logitech. It's the sideways mouse that is supposed to help with carpal tunnel and it's been fantastic after I got used to it. I'm actually surprised that they have any current mice that are not USBC.

Is it an older model that is popular that they just aren't changing because people are still buying them? If you're willing to try something new you might be surprised by the improvements they have in their latest lines.