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There is a GPR unit for sale on Ebay this week. It looks to be in nice shape. The same guy also has a side scan for sale
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1332939964
Click Here
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1332939964
Click Here