To join TRAC, you must be a current member of AMA (Academy of Model Aeronautics).  Your AMA membership provides liability insurance that is required by Hillsborough County for TRAC to use the flying site.
Adult     $125 annually payable in semi-annual or an annual payment 
Family   1.5 times the annual Adult membership, $185
Junior     $35 annually for members under 18 years of age 
Fees      Initiation  $75 one-time fee, waived on Junior memberships 
Re-join   $35 if membership lapses more than 3 months