If you have a large family or share some of Toothbrush heads with friends, this is a really good bulk deal from OZsale.
This is $2.5 per brush head. Amazon is roughly $6 and you can expect to pay $10 or more per head at the supermarkets.
$7.95 shipping for most post codes in Australia.
New Bristle Technology: Oral-B Floss Action brush head turns from green to yellow, indicating when it is time to change. Features MicroPulse bristles that help provide a superior deep clean between teeth*. The bristles on the round brush head are designed to clean deep between teeth to remove up to 100% more plaque leaving your whole mouth cleaner than a regular manual toothbrush