Looks like NAB is running a 20k/10k sign-up offer across all their rewards cards (including Flybuys) from 1st November. Apply (and make an 'everyday' purchase) by 13 January. NAB Qantas …
About $20 more expensive than the Crucial M4 at B&H, but the Sandisk one seems to be quite a bit faster (especially in terms of write speed). Should be worth the $20 extra I reckon.