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Good deal on this Vacuum from Amazon AU. Second cheapest price ever on OzBargain (30/03/2018 was $424 - https://www.ozbargain.com.au/node/369748)
Don't forget to use Cashrewards - I am a little unclear on the amount of discount from Cashrewards for this item so haven't included it in the price above.
You look in the top left of the Amazon listing screen to find the category (in bold on the left) - this one says "Kitchen & Dining". Then you just go to the relevant cashback website and they have a list -
https://www.shopback.com.au/amazon-australia
https://www.cashrewards.com.au/amazon-australia
Find the category that matches and voila.