Cant help with price tracking, but I also tend to check Appliances Online and then buy from them when the price is right for me. Bear in mind that whilst places like The Good Guys might price match, they dont usually do free delivery and removal of the old, as AO do. Even as we speak I have a washing machine in my cart
I find AO to be the most reliable, not always the cheapest but usually pretty close to it. Delivery and install is just no fuss, and no mess left behind. I think I would go with them anyway, and pray for a reasonable price at the time.