LiveWarehouse has the Microsoft IntelliMouse Explorer optical mouse for $19. This is the best mouse that Microsoft makes that is corded. I currently use it right now and have been extremely happy. It normally goes for $40-$50. It's very comfortable, it's features and drivers are excellent, and it's lasted well. Use coupon code "msex5" to drop the price to $19, then add $5 for shipping. Enjoy.

http://store.yahoo.com/livewarehouse/mumi94000.html