The free site for EC County (those properties OUTSIDE the EC city limits, but within EC County) is http://www.bis-net.net/ECCounty/search.cfm.
If you want info on properties WITHIN the city of EC, use this site: http://www.bis-net.net/cityofeauclaire/search.cfm.
If you need help with anything else, feel free to contact me at 715-577-0028. I was born and raised in Eau Claire and know this area well. Good luck in your home search!