Logitech MX620 Wireless Laser Mouse for $19.99 after a $25 rebate. Shipping is free on orders over $50 or select in-store pickup to save on shipping. It has an alloy scroll wheel that operates in 2 modes: free-spin mode or click-to-click mode, along with forward/back buttons for web browsing and paging through large documents. Most places have this mouse for about $48.
Originally posted earlier, this is just a friendly reminder as it is expiring soon.