Looks like a cracker of a deal for dual-side pedal power meters. Last OzB post for a power meter was for a left-only crank power meter.
This is a clearout sale of previous gen PowerTap P1 pedals, but according to all indications there have only been minor changes to the design for the PowerTap P2 pedals. You're looking at ~$1.2k AUD for a pair of new dual-side PowerTap P2 pedals or Favero Assioma DUO pedals.
DCRainmaker's Power Meter Buyers Guide (includes info on what a power meter does)
P1 Pedal Review DCRainmaker
P1 Pedal Review GPLama
P1 Pedal 6mo Update GPLama
Keep posting the cycling equipment deals! Surely with the busy power-meter market there will be a decent dual set for <$500 in the near future..