Can you get a sacrificial anode at Bunnings??
This question gets asked quite a lot and unfortunately the short answer is no they don’t sell them..
However they can be found at many plumbing supply stores even on ebay. In addition there are a number of online sellers around Australia that will post them out.
You just need to find out what size hot water system you have and what brand. From there its fairly straight forward to figure out which one you need.
The most common length is 1210mm that will fit a 120L to 165L (depending on model) and can be found here.
Hopefully this helps and if you have any queries feel free to contact me.