This is going to be a niche post but Swiftpoint has both of their products for $50 off for Cyber Monday. This company has been popular with crowdfunding for good reason. Their mice are high quality and rarely on sale.
The GT is meant for travel and work because of it's compact size and smart gestures.
The Z is designed for gaming. This is the one I have. I love on-the-fly profile switching with the OLED screen and the endless customization options. You can add macros to tilts, swivels, deep clicks, pushes, pulls, everything. It's pretty cool.