One way Perth to Broome hire at Europcar $25 per day
Broome 2500km from Perth and the drive up there is one of those epic road trips with some absolutely beautiful scenery. This is obviously a cheap way for these guys to get their cars up to Broome for tourist season.
Lets say you wanted to take a reasonably leisurely jolly at 500km a day. Min 5 days rental so theres $125. Id assume one of these cars will get you about 500k on a tank so you'd be looking at 5 fill ups at lets say $70 a pop, theres $350.
Still works out cheaper than flying assuming there's two of you and you wanted to see a bit of WA.