FDREF53488
Batman or Barbie Colgate Power Toothbrush $4.64 (Normally $16) at The Warehouse.
Unfortunately they are assorted, so no option to choose.
You could buy a few, choose the one you want and return the rest.
35 units at the time of posting this deal.
There is also this augmented reality toothbrush.
Colgate Magik Toothbrush $11.98 (normally $20.00).
https://www.thewarehouse.co.nz/s/twl/product/R2695743.html