[kismac] Where to order a cheap Prism2 USB device?

I've been trying to locate an inexpensive Prism2 USB device that can do
injection. The Kismac hardware list is great, but it's difficult to
determine the revisions/versions on many online stores.

The WUSB11 is easy to find, but I've never seen the rev/ver noted.

Any suggestions for an online source of an inexpensive Prism2 USB device?

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