You don't ever need to pay to go to a site like that. Every state in the US has a link on their Revenue Department, or Treasury Department or Taxation Department or Attorney General's site to find unclaimed funds.
I don't know what state you are in or I would give you the state site, but the simplest thing to do is go to your state's main web page, and type in unclaimed funds in the search box.
Do the same for any other state you lived in. There is never a charge.