What size car? What dates? What is the best total price you found so far?
Hertz is usually more expensive in MCO than Alamo/National. Also, they are off-site. They do run a 'cheap' Simply Wheelz affiliate that has competitive prices though.
there is a thread on the Hertz forum on Flyertalk with codes and discount offers. I use my corporate CDP but sometimes the weekend or AAA rates are quite good, if you are looking for a weekend rental.