NVM, it's only the Star Destroyer that's $20 cheaper, everything else is pretty much exactly what I thought it'd be based on US dollar comparisons for other sets.
shopforme.com.au is having a Force Friday sale with 25% of TLJ sets.
For Sydney collectors, Summer on Gumtree has listed several of the new TLJ sets for pretty competitive prices (20+% off RRPs):
75144 UCS Snowspeeder $260
75179 Kylo Ren's TIE Fighter $90
75188 Resistance Bomber $120
75189 First Order Heavy Assault Walker $180
75190 First Order Star Destroyer $180
変われ! ヘッドマスター! Kaware! Headmaster!
戦え! ヘッドマスター! Tatakae! Headmaster!
Quite a few Lego items from a range of themes on clearance at Big W. For example, some Star Wars Constraction sets have been reduced to $10. Lego Batman movie figures are now $3.
There are a few bigger ones half price at Big W. The Lego City Airshow with the two fighters, old plane and hanger was half price at $48. Also saw a big Batman one and I think a Superhero Girls one too.