Investing in Property Tax Liens

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Is there any one that has experience and / or specializes in purchasing tax liens? I purchase properties from sherrif sales that I fix and flip. However, I've noticed once or twice a year, there's a tax lien sale and I've been tempted to bid on some tax liens. It sounds like there is a lot more risk involved. Would love the community's insight on tax lien sales - are they profitable? what due diligence should be done? how much interest rates can be charged? how long does it take for the lien to be paid off? Looking forward to hearing back. Thanks!