Don't use rental cars.com!!!
Whatever you do, don't use rentalcar.com.
These pricks charged me 70USD for insurance for a 24hour hire! I was in a hurry so missed the automatically added charge. I assumed I could decline it when I picked up the car. Wrong!....the charge came through on my visa within minutes. I tried to contact them before picking up the car, but no contact number was provided at the pick up point..only a phone number in the UK. Like I'm going to make an 1min call to the UK to try to sort it out.
Emailed them during the hire to tell them I didn't want their insurance (I also use the worldwideinsurance yearly deal). Initially they said the charge must be something to do with the rental company (avis), which it clearly wasn't. They refused to refund the money. Eventually their last email included the words "we're sorry for the inconvenience. It wasn't inconvenient...it was a fkn ripoff!!!
In all, it cost almost 180USD to hire a small car for a day in Australia.
Oh..and interestingly, when I picked up the vehicle, the Avis rep said "yes, a lot of people seem to be complaining about this company"