It's only 3 cents cheaper than the current deal at Amazon and not as cheap as the Rainbow 6 Siege model available from Centrecom., but it does give another purchase option.
Based on previous ozbargainer comments, Officeworks should allow price beat against Costco, bringing the price down further to $151.97 (you may have to show proof of membership). Stock at Officeworks does seem quite limited though.
Or just show them the Amazon Link.