I used to try and maintain a series of pricelists for Silent components from vendors in Australia. 5 years on from my initial foray into silent computing pretty much every shope stocks silent components. So for now I will link to my favourites. If you need more information I suggest you head over to www.silentpcreview.com

These are shops I have purchased from, and would personally recommend for silent PC gear
http://www.nexus.com.au – VIC (Scythe Distributors !!)
http://www.pccasegear.com – VIC (Stocks SEASONIC)
http://www.scorptec.com.au – VIC (Stocks Antec + Zalman)
http://www.auspcmarket.com.au – NSW
http://www.cpl.net.au/ – Vic (no shopcart system)
http://www.msy.com.au/ – Vic (Shopfront only)