Do not book with Webjet. They are a fraudulent operation. I canncelled my wifes ticket 3 weeks prior to the flight and requested the taxes portion of the ticket. Webjet refused. Airlines will refund the tax portion if a flight is not taken as the tax is not paid to goverments until the flight is taken. As a result of Webjet refusing to refund the taxes they can pocket the money as additional profit.
Compare prices: On LowCostRoutes.com you can find the list of all the airlines flying from an airport/city to another. This way, you will know exactly which low cost airlines offer cheap flights on your route and you will be able to compare their prices and schedules in order to choose the flights that suit you best.