Perixx makes a few left-handed variants of their mice. I’ve been using their Perimice 513L for several years. Sadly, their newer models are all wireless.

https://perixx.com/products/perimice-513l

https://perixx.com/products/perimice-713l

https://perixx.com/products/perimice-719l

I tried the 719L and didn’t like its shape, too small/round. I should try the x13L ones, not sure why I didn’t.