Yeah as the guys said, the Big W prices a tad cheaper than prices on the LEGO shop and if you factor in the shipping then it's definitely cheaper at Big W.
I was rather disappointed that Big W didn't have any sales on these new Pharoah's Quest sets as well. I'm totally into ancient Egyptian stuff as well and these 6 sets are also on my WANTS list.
I'm planning to just put the whole lot on lay-by on a separate receipt and then if there are any sales further on on these sets and they are available, then I'll just cancel the lay-by. It's sort of a safeguard that you have them rather than risk not being able to find them in future or at inflated prices.