I'm shocked that you can't find it anywhere?? Where have you looked? I'm sure Circuit City, Best Buy, Fry's, even Walmart has it or something similar. I have several wireless optical mice myself.
Here are a couple of links you can check out, too:
http://www.tigerdirect.com/applicati...x=0&image1.y=0
http://www.pricewatch.com/ click on MICE, you'll find more than you ever want. Only buy from a vendor with good ratings.