So I bought Nikon D3400 form The Good Guys for $549 expecting $50 cash back from Nikon (https://mynikonlife.com.au/cash-back/) and $50 store credit from The Good Guys.
Today I found that JB Hi-Fi is selling D3400 for $509.15. I've submitted my request for 30 days price guarantee and The Good Guys sent me another store credit of $47.82 (120% of difference between $549 and $509.15). So the final price would be 549-(50+50+47.82)= $401.18 Of course $97.82 in store credit is not technically the cash, but anyway…
Mod: The above is no longer relevant as TGG price is now $509 (you can no longer purchase from JB Hi-Fi for $509.15 and submit a price guarantee to TGG. Therefore the deal is $509 at TGG - $50 cashback = $459 + a further $50 in store credit (for click & collect orders).
So title is meant to be D3400 for $509.15 @JB Hi-Fi