Full Price is $549 before discounts.
Ok, not hard but some steps involved.
Available in white or black, none in the store near me so i had to get delivery for $8.
Buy a $450 Good Guys GC from the Shopback store app on your phone and get 3% cashback - $13.50
Use code SAVEBIG (all in caps) on the good guys website to get $82.35 off the price
Current Shopback cashback is 6% - $27.99
Taking all discounts into account you end up at $425.15 in store pickup or $433 delivered.
The one snag in the whole exercise is that shopback says you can only use codes listed on their website and SAVEBIG is not listed, however, they are advertising the current 10 - 20% off promotion at The Good Guys and this discount is only available by entering the SAVEBIG code, no reductions in price are available on any items unless you enter the code. So either Shopback is being disingenuous or they haven't updated the site to include the code yet.
Haven't received a confirmation of the 6% Shopback cashback yet but will advise when i have (sometime takes a few hours).
Not sure if purchases where you use a gift card will result in the 6% SB cashback.
If not its still the best price i can see to date but less attractive.