Do not procrastinate car rental bookings. Take a perspective by searching the prices online and get a baseline to start with.
Several car rental companies offer discount car rental if you pay upfront while booking online instead of paying on the spot.
Many credit cards offer rewards when you rent a car. Get the benefit of such reward offers.
You can bundle up your car rental booking with flight booking and hotel reservation. Such packages can be economical.
Always avoid renting at the airport if possible. Renting a car at the airport can be expensive than booking online.