Logitech’s MX Master Mouse and MX Anywhere 2 are almost certainly huge upgrades over whatever mouse you’re using right now, and both are on sale on Amazon.
Both mice can track on any surface (including glass), excellent battery life, and the ability to switch between multiple devices on the fly. The Master though includes a more ergonomic design and a special thumb wheel for horizontal scrolling and advanced gestures, while the MX Anywhere 2 has slightly better battery life for $10 less.
And if you missed it over the weekend, the Logitech Marathon Mouse is also marked down to $20. It doesn’t have as many features as the two mice shown above, but its battery can last up to three years at a time.