If you do not have the time to attend tax lien sales in your area, there is always the opportunity to buy properties online. Search for counties that offer these types of sales and you can register for it. It is always free to register. Take note however, sometimes a deposit is needed before you can actually bid.
Register for the tax sale, read the terms, acknowledge the rules, and don’t forget to do your due diligence on the properties. Even online you can watch what happens to the properties that are being bid on by other investors. This would give you the confidence to bid at the next tax lien online sale. It would also give you a feel of what the competition is like.