| Real tax line properties are sold at auction normally once a year at the county courthouse they are located in. Some publish notices online, and others do not. Most are published in local legal sections of papers and on notice at the court house.
They are sold ( or a tax certificate is sold) to the highest bidder for cash at the courthouse door the day of the sale.
The sites that sell lists do nothing but search for all of the notices and give you that info, nothing you can't get for free by calling the county courthouses in your area.
Depending on your state, you will either get deed that day or just a tax certificate that you hold for 1 to 3 years for a redemption period of the present owner. ( if they redeem it, they pay interest, here it is 10 percent.
Plus there are also as noted foreclosures, bankrutpcy sells on a reguar basis at all county court houses.
The bad thing on tax sell "lists" is that from the time they come out till the time of the sale 2/3 are normally paid and do not sell. many get paid the week of the sale, so often you may look at dozens of properties to find they will not sale that day. | 
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