First time post so be gentle.
Ive been waiting for Prime to see if these popped up
Philips OneBlade Replacement Blades for All OneBlade and OneBlade Pro Models (Model QP240/50) (Pack of 4).
One-time purchase: $61.63
S&S $55.47 ($13.87ea)
That was good enough for me but it looks like you may be able to stack with a NAB Visa card.
Additional $10 off $80 on eligible NAB Visa Cards. Enter code NAB10 at checkout.
These are the old blades, pay a bit more to get the 360, worth it