I have the thermaltake commander mouse from that mouse and keyboard combo thing. It works well, but it's kind of small. Any suggestions?

It's a little hard to grip, because it has this slope on the side where my thumb is, and it sometimes makes me click the side buttons when I pick it up. My friend has a steelseries sensei, which I have tried. I really like how the thumb side is convex instead of concave like the commander. I also like the textured rubber on the sides as well. Are there any mice like the sensei in terms of size and grips, but less expensive? Ideally around 30 bucks