If you're still using a corded mouse, it's time to get with the 21st century. One-deal-a-day site Yugster has a Targus wireless rodent for just $6.95, plus five bucks for shipping. It's a refurb with a 90-day warranty.
This three-button optical scroll mouse relies on RF technology (meaning no line of sight required) to communicate with its USB dongle. When the rechargeable battery gets low, you simply connect the mouse to the dongle using the included cable. You can, of course, continue using it while it's charging. There's also a USB extension cable so desktop users don't have to reach behind their PCs every time they want to plug and unplug the dongle.
Of course, this is really more of a travel mouse, one for notebook users whose machines lack built-in Bluetooth. (If yours has built-in Bluetooth, look for a Bluetooth mouse instead, one that doesn't require a full-time dongle.) At $11.95 shipped, it's a hard bargain to beat (it sells new for $29.95). Act fast: The offer expires at midnight today.