You don’t have to wait for an annual property tax lien auction to buy tax liens. Counties in many different states offer their unsold property tax liens for sale throughout the year. Many county tax collectors and county treasurers provide a list of their available property tax liens on their websites. Some of these property tax liens can also be for undeveloped land without any houses or buildings on top of the land. You can use the websites of tax collectors and county property appraisers to do your property research and conduct your due diligence. If you find a property tax lien that you would like to purchase, you can simply send your payment to the tax collector and receive the tax lien by regular mail.