New 2.4GHz Wireless Optical Mouse Mice for Computer PC Laptop+USB 2.0 Receiver for $5.99 with free shipping.http://m.ebay.com/itm?itemId=160833284196
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I'm concerned that it doesn't list a brand name. Might just be Chinese junk. If you're patient the name brand mice will occasionally drop to 5-10 dollars if you're quick.