1 free day & $5 discount per day @ Budget Car Hire + 2.5% cashback
Budget have a promotion on for bookings made before 22/02/07. If your booking in Sydney (airport & city), Melbourne (city or airport), Brisbane Airport, Collangatta Airport or Cairns (airport & city) for a hire period commencing before or on 31/03/07 you get one free day and 'should' get the $5 per day reduction for an online booking. I say should because I havent been able to figure out where the $5 reduction is applied - but they advertise it on the site so therefore need to give it somewhere.
If your booking the airports watch out for the airport levvy that they charge. If possible your better booking and picking up from the city. Coolangatta airport levvy is $27 - a bit steep if you ask me.