Got an MX Revolution through Craigslist for cheap ... but it lacks the little wireless USB receiver. Needs to be from a 810-000422 mouse (printed on the bottom). Payment will be via non-CC Paypal. Contact me here or via AIM @ JaYp146. Thanks for looking! Thanks to quique55 and antok86 for pointing out the receiver on the Logitech website, but I'm hoping to help someone on the forums out who may have a broken mouse and a spare receiver they're looking to get rid of.