That’s actually not a lot of kilometres for a modern car, even a small hatchback like a Hyundai i30. Modern cars are actually a lot more durable in the long term than older ones, so I wouldn’t be worried about the distance travelled. Given that the average car in Australia travels about 15,000km a year, 108,000 is actually about right for a car that’s now eight years old. That said, the car’s chances of being reliable for the next few years will pivot on how it has been maintained by its previous owners. Make sure the car you buy has a full service history with no gaps in that document suggesting it has missed any scheduled preventative maintenance. Unfortunately, many people who purchase budget cars like the Hyundai tend to maintain them in a similar way and that often means corners are cut. But if the service history is intact and complete, there’s no reason to suspect the car won’t offer years of reliable service. The price you’ve been quoted seems about right for the car in question.