I searched nationwide for warn overdrives:
http://portland.craigslist.org/clk/pts/2017217087.html $400 obo
http://omaha.craigslist.org/pts/2011016792.html $600
http://oregoncoast.craigslist.org/pts/2010753928.html $400
http://sandiego.craigslist.org/esd/pts/2009398987.html $750
http://yakima.craigslist.org/pts/2006752515.html $350 (priced for quick sale)
http://boston.craigslist.org/bmw/pts/2014387782.html $180 (main ring gear stripped)