Real Techniques makeup brush sets are currently part of iHerbs's weekly special of 10% off Bath and Beauty products, which also happens to stack with the current 10% off everything deal, making this price point as low as these brush sets ever go.
The best deals are either the Your Base Core Collection:
http://au.iherb.com/Real-Techniques-by-Samantha-Chapman-Your…
or the Your Eyes Starter Set:
http://au.iherb.com/Real-Techniques-by-Samantha-Chapman-Your…
The price for the sets is AU$26 delivered without a Rewards Code, or AU$19 delivered using a Rewards Code. My code is OKE962 which gets first time buyers US$5 off, which translates to A AU$7 discount.
As always, these are significantly cheaper than Priceline who have them at $47.50 and $45.00 respectively, though both are currently OUT OF STOCK online. These are popular because the quality for the price is pretty much unbeatable.
Good price!
The brushes are synthetics made to look like badger hair, but apparently are still really high quality.