I have used OW PBG a few times on tobydeals with success. It seems many people have been declined in the past.
There have also been issues mentioned of the tobydeals URL not being available on in-store computers, but as this is online only for OW you have to call them.
It might help by giving them the URL as tobydeals.com.au - that actually redirects to tobydeals.com/en_AU
Either way I was successful over the phone with a price beat.
I can see it was listed much cheaper a couple of days ago, but is now expired and it seemed to be coming from the UK.
At least with this officeworks deal you have local stock, local warranty.