Anybody found a good tax lien certificate and tax default property course?

[Nicholas Cook]

There are 3 courses that have recently come to my attention about tax lien certificates and tax default properties either from others on this forum or from other real estate investors I know.

1) https://www.taxsaleacademy.com/

2) https://tedthomas.com/

3) https://taxlienacademy.com/

I think all 3 courses range from $1500 - $2000.  From the research I've done, it appears this business is legit and a great way to make money if you know what you are doing. I did sign up for the 1-day webinar with Ted Thomas for $47 and found it interesting, but he does have an upsell to join his course. 

Does anybody have experience with any of these 3 courses or know of another one that is good?