TLCs and the best states to invest in?

Anyone here had experience investing in Tax Lien Certificates? I just attended this seminar where they suggest us to use 0% introductory money to purchase such certificates. I don’t see any problems with it, now the question is which state to go for first? Is there any good site where we can find out more details about this subject? I actually purchased a system called: how to invest in TLCs by Wayne Gray… and I am quit disappointed at the information provided. any suggestion??

any forthright guru should have a money back guarantee … ask for your money back or sell it on ebay!

the bad news is I bought the package at the learning annex for the price of $2,000. I checked on ebay, the going price is around $200. ouch!