Logitech MX Vertical drops to $74.99 (38% off): ergonomic vertical design, 4000 DPI, multi-device. Amazon If you spend most of your working day at a mouse, the Logitech MX Vertical is one of the more practical desk upgrades you can make, and at $74.99 it’s down $45 off its $119.99 list price in a limited-time deal. The vertical design isn’t a gimmick: Logitech’s own testing shows a 10% reduction in muscular activity compared to a standard mouse, and the 57° wrist angle addresses the pressure points that build up over a long day in a way that a standard horizontal mouse simply doesn’t. What you’re getting The MX Vertical’s 57° angle puts your hand in a natural handshake position rather than the pronated grip that standard mice require. That rotation takes the pressure off the forearm and wrist, and the dedicated thumb rest positions your thumb comfortably without any adjustment period.…