This is something we've looked into before and there's sadly no simple answer. The major rental companies generally don't do bulk discounts so even though you'd be keeping the car longer you probably won't get much of a discount. It is worth giving them a ring-around but we doubt you'll get anywhere. 

 

A potential option could be buying a car on a PCP finance scheme where there is an option to hand back the car and clear the finance. It all depends on keeping the deposit low so that your total outlay is small enough to make sense though. Generally deposits for a new car have to be at least 10 per cent so if you need a larger car this may end up being too expensive. 

 

The best option could actually be to indulge in a bit of 'Bangernomics.' Buy a cheap, reliable second hand car - either one that's so cheap it's literally disposable or one that you can entrust to a friend or colleague to sell on for you once you've finished with it. How about this? We found a 2003 Toyota Avensis Estate for under €2k. You'll easily get three months use out of that and should be able to find someone to take it off your hands for, say, €1,500 when you're finished with it. http://www.carzone.ie/search/Toyota/Avensis/AURA-TOU/201514232246592/advert?channel=CARS