Sony KD43X8000G 43" X8000G 4K UHD Smart LED TV $636 + Delivery (Free C&C) @ The Good Guys eBay
Good quality model for this size TV. I couldn't find many higher end TVs at 43 inches, which seems to be considered a small size these days.
This price is very good compared to other stores at the moment. Cheapest historical price I could find is $839 box damaged from Sony.