JB HiFi is having a 20% off GPS sales both online and in stores. They also have the new TomTom range (GO510/610/5100/6100) in stores so if you're after a new GPS now might be the time to buy!
I personally bought the TomTom GO5100, price was $349 and the sale brought it down to $279.20. Given that it was released around the end of April, it's a pretty good deal!
Online stores doesn't have the new TomTom range yet but they do in store. Best to call ahead to check stocks if you're after one.
So how does this work any better than my phone or tablet that has free nav app (scout) installed?