Well the majority of them anyway. They are considered consumables (like drill bits & screwdriver bits). Dewalt, Bosch, Ryobi, etc, etc
No matter, in the case of Bunnings, most staff aren't aware of it, so just go from store to store until you find one who will give you a replacement drill.
Or in my case, Bunnings replaced the entire 3 piece kit that the drill was part of which included 2 batteries & charger with 6 brand new items that were higher quality than the originals!! For a drill chuck that was difficult to release (not failed)!
Woohoo!!
Interestingly, Ozito give you the full 5 year warranty on Power Exchange products, including the drill chuck.
Until you post this. Err.. thanks?