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Bigw has the Ninja Foodi OP300 for sales at the moment $250 + delivery. Delivery was about $7 for me but may differ depending on location. It is online only sale so not available in store. Not sure there has been better deals but it's about $150 cheaper then what was recently listed as (normally $399). Ninja themselves have recently put this on sale themselves at 25% so other stores have followed suit but Bigw has gone and added an extra 25% discount on top it, not sure how long it'll be on sale for. If they run out, kogan also has them on sales at $285 which if you're with CBA($30 cash back via rewards) and have kogan first(or trial) you can get it for about the same price.
Have it. Love it. Roast some chicken and veg for a soup, then chuck it on pressure cook for a couple of hours in the same machine.