I saw in Chemist Warehouse catalog they have the "Oral B Toothbrush Triumph with Smart Guide (IQ5000)" for $138.99. I assume it can be bought instore, and it can be bought online with free shipping.
As posted a few times already on OzB, Oral B are giving $50 cashback on this toothbrush, bringing it in at $88.99 which is about the best price I've seen.
I got this toothbrush at the beginning of November when shavershop had a pricing error and can highly recommend it (at least my teeth feel more sparkly, and it encourages me to brush my teeth for 2-3 minutes morning and evening!). The Smart Guide is basically a linked LCD display which has a countdown function for how long you've been brushing, an indicator for when you're pressing too hard, and when not it use, it's a digital clock.
Cashback claim form: http://www.oralb.com.au/assets/pdf/offers/12114_Xmas_2011_Ca…
Edit: I also just saw the Chemist Warehouse are offering a "free crappy gift" with any online purchase (tape measure and level keychain). What more incentive do you need?!?
http://www.chemistwarehouse.com.au/promotions/freegift12/
got excited for a min, thought it was another error $89-50!
think free shipping if for order over $99.
can probably price match at big w