A bit different from previous deal which has been removed to a forum…
I got my super dodgy wall USB charger (bought from an eBay seller in Hong Kong, got very hot in 5 minutes, noise while charging, iPad frozen while charging, took forever to charge up, etc…) swapped for a genuine 10W power adapter for FREE.
I used my iPad 3's serial number.
This could be their system glitch or intended, who knows.
It seems that
3rd party charger + iPhone serial + $14 AUD = genuine 5W AC adapter
3rd party charger + iPad serial + $0 AUD!!! = genuine 10W AC adapter
10W or 12W?
I would go with glitch either way.