Here are a couple of USB monitors for Windows.
http://benoit.papillault.free.fr/usbsnoop/ http://www.hhdsoftware.com/download.html
The second one is a comercial product that you can try out for 30 days.
Fow actual boxes there are http://www.catc.com/products/usbtracer_trainer.html but they don't list their prices. My experience is that any protocol analyzer box is VERY expensive.
//Roger
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