I have one of these that I bought from Catch, but this price is slightly better, plus you get cashback from cashrewards. It's 1cm thicker than the one on sale at Kogan and the zoned, grooved surface provides better support and possibly better airflow. I certainly don't get any hotter using it than when I was sleeping without it.
Original Back to Work 20% off Selected Sellers on eBay Deal Post
I bought an 8CM thick one from these guys.. I love it.. wife not so much.