ProtoArc Ergonomic Mouse, EM11 NL Bluetooth Rechargeable Wireless Vertical Mouse, 3 Multi-Device Connectivity for Computer/PC/Laptop, 2.4GHz USB-A Optical Mice for Windows, Mac OS, Blue

I had a Logitech MX vertical mouse that I liked a lot, but the left button wore out in < 2 years. I replaced it with a much less expensive Protoarc which so far I like just as much. It'll be 2 years this December, so we'll see soon if it's more durable than the MX I had.