Many of the counties that offer liens for auction or sale list them down several weeks before the auction date to make interested parties aware of their availability. One of the most important things to do as an investor is to purchase the security interest certificate at the most affordable price you can. The investor will also have to brace for the possibility that the current owner might actually be able to pay back what is owed and be able to redeem the land. If you're interested in making money in a creative way, you may want to invest in buying tax liens