Off the Back - Oral B Braun Precision replacement heads for electric toothbrush - 10 for $37.99
This website is $37.99 for 10 heads.. and postage is only $5.99 (I think this is max as I bought 4 packs of 10 and was only charged $5.99)
If you only buy 1 pack of 10 plus postage you are paying on $4.40 per head, which is well below regular sale prices.
From their website -
"About Off The Back
Off The Back is a New Zealand based company which launched into Australia in late 2010. The business began in 2007 as three friends with a passion, an idea, and a mission - to provide customers with the best online deals every day.
Each morning, three new and exciting deals become available on our website from 9.00am (Sydney time). These deals are available for 24 hours or until they sell out!"