Discover Cars – A relatively new company in the car rental supplier market that is worth checking out. You'll find deals with all the major car rental companies in Ireland, including Avis, Hertz, Alamo, Dollar, Thrifty, National, Sixt, Europcar, and Budget. Read company reviews on TrustPilot.
Auto Europe – This is one of the oldest car rental suppliers in Europe, with 24,000 car rental locations across the world. The company offers free cancellation 48 hours before pick-up and a 24/7 support hotline during the length of your rental.
EuropCar – I admit I haven't used this car rental company, but as with any other car rental competitor in Ireland, you should do your homework first before booking.
Rentalcars.com – The world's biggest car rental supplier providing rental cars at over 60,000 locations across the world.