Hey Angry6,
I haven't seen any plug and play PID controller on the Australian market,but there are a lot of talk about brewers building
there own with the help of a licensed electrician.The Americans have a few on the market with a laptop controlling the hardware via wifi.
I have a BIAB set up with a PID control and highly recommend the effort and cost,i have combined this with a pump to evenly
distribute the temperature around the mash.