Deal won't appeal to everyone as most prefer to use phone maps (usually I'm the same). I'm heading from Melbourne to Darwin shortly and wanted a dedicated GPS rather than using a phone/iPad for 4 days of driving.
Although their original price is higher than everyone else, $279 with the discount and express postage is pretty good. JB have it for $329, best they could do was $310.
Google maps reports a grand total of 3 turns to get to Darwin from Melboure, that just paid for ya fuel!