walmart has this "Logitech Full-Size Wireless Mouse" for the same price as the M190... I can't find it on logitech's website but it looks just like the M310, but the M310 is more expensive and the packaging says M310 on it, so I don't understand what's going on here. but I wonder which better.
https://www.logitech.com/en-us/products/mice/m190-wireless-mouse.910-005901.html
https://www.logitech.com/en-us/products/mice/m310-wireless-mouse.910-001675.html