Not sure on how these actually perform in terms of picture and smarts, but this seems the cheapest available atm on these models (from my quick price search on google).
50" deal - http://www.binglee.com.au/hisense-50k390pad-50-fhd-3d-led-tv
Quick specs for both:
Hisense 3 year factory warranty
4 x HDMI
3 x USB
100hz
Built in WiFi - Android/Google Smart TV
Delivery might kill this deal for those not near a Bing Lee store, but with a bit of asking and haggling you should be able to get competitors to match.
Edit - tested delivery for the 55" to my location on Sunshine Coast, Qld - $40 flat rate.
Good price for the 50", I paid just under 800 for mine :-(