I have a Logitech MX 620 mouse sent to me by Logitech for a replacement for my dead MX 600. Brand new still in package. I already had another MX600 that is going strong, so I am selling off this brand new one. $50 + shipping.
These are very comfortable. My favorite Logitech mouse shape and design for comfort and functionality. I have several similar shaped mice and they all are great, 2 MX 620, the MX600 that died, and a MX 610 which is discontinued. Buy this before they stop making these. Has the super cool hyper fast scroll wheel which you can set to click by click or free spinning (to rapidily scan through long documents), and battery life is great.