I noticed this in Big W's catalogue the other day, I thought it might be an error as S2 Blue-Ray (which was the only one advertised) retails at $49.99 every where else. Went in store and checked, it was correct however both Warrawong and Dapto had 0 stock to start with and they don't raincheck (which is pretty poor starting an add with zero stock). However, they had S1 there so I decided to check that, low and behold $19.72 itself which is a bargain considering it retails at $84.99.
I don't know what stock is like at other stores, I doubt its great but if your after the blueray stars wars like me, this is a great price.
There on page 40-41 of the catalogue I believe (it didn't like me linking the direct item, no idea why).
Just remember, you can't layby them as singles nor together as they don't reach $50.
(If anyone finds a S2 could they contact me incase I am unable to get one down here, thank you in advance).
Cheaper than the UK. Positive from me.
Oh and by the way, these sets are fantastic.