Where are they and when do they take place??

Check out this web site

Tax-sale.info (http://www.tax-sale.info/)

Also contact your local property tax office

I recently researched Michigan property tax sales and found that they are held once a year in each county, with dates scattered throughout the year. Interestingly, the properties have already been foreclosed by the counties, so they are all county-owned at the time of the sale.