Yes there are buttons. Search for vertical mouse. Several companies make them.

A lot of people like them.

I used a vertical mouse for a while and found that it puts more strain on my shoulder and ended up going back. Your mileage may vary

I have the Logitech Lift which is quite comfortable to use. They also have a bigger one called the MX Vertical. But many people say it’s a bit too large for them so I bought the Lift since I don’t have big hands.

I've got a vertical mouse and I love it. hell I had to use a regular one at work recently and it felt sooooo wrong to use. there's definitely an adjustment period in the beginning but humans are nothing if not adaptable. I recommend 100%

Ergonomic mice almost all look like this

Got a cheap bluetooth/2.5Ghz trackball for my laptop, and wow, those are SO nice when you don't have a lot of space to work with.

I hope some mid-level enthusiast trackballs that aren't ridiculously boutique become a thing soon haha.

The orbit worked really well for me. I used my thumb for the left click, pinkie for the right, and the other 3 to better control the ball.

The only big complaint I have is the wrist rest they include: it's really hard, and comes off real easy.