There are several way to find cheap car rent like you can hire a car through physical car rental office or online car rental sites .I believe car rent through online is quite easier because several times i booked car using online.
I am frequent traveler and love to travel several time and that's why i need book hotel,car,cruise before i start journey and you know its tough to book all of them physically. I always use TravelSites when its about booking something relates with travel.