Found this when doing one of my periodic searches for Model M keyboards on eBay...
http://www.ebay.com/itm/IBM-TrackPo...10?pt=PCA_Mice_Trackballs&hash=item19d8ba0bf2
http://www.ebay.com/itm/IBM-TrackPo...10?pt=PCA_Mice_Trackballs&hash=item19d8ba0bf2
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