Was just having a look for a dashcam and came across this, seems to get decent reviews, has GPS, front and rear cam, and about $50 cheaper than any other retailer.
Has been cheaper in the past, so if you aren't in a hurry it may pay to wait for a big Repco special or similar.
As rdrooster pointed out, cheaper at repco. Also Officeworks stock this so you can price match and get it for $135 or so.
Repco is cheaper : https://www.repco.com.au/en/in-car-technology/driver-assist/…