Hey Elk-

Last year we bought a GPS for my F.I.L from this place:

http://www.tigergps.com/gpsreceivers.html

I remembered that they sell Bulk, look for number at bottom of page. They also have info about bulk orders on their "about Tiger GPS" page. They were good folks, call em up and see what they will do for ya.
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You know something bad is going to happen when you hear..."Hey, hold my beer and watch this"