INTEL 520 OEM 60GB/120GB for $95/$149
INTEL 520 RETAIL 60GB/120GB/180GB for $98/$165/$245
I found these prices by accident, as they don't appear on Staticice or Shopbot. These are the cheapest AU prices I know of.
The cheapest I can find a Retail 180GB for is $284 + shipping. MSY has the Retail 120GB for $169 (at least I think it's Retail) but no higher capacity.
PCDIY do not have 240GB however. (If you're after that one, the cheapest I can find is PCCaseGear for $349 (+ shipping) Retail, or Umart for $338 OEM).
OEM drives include just the drive. Retail boxes include the drive, mini-CD with installation and warranty documents, drive bracket and screws, SATA cable, SATA power cable, USB to SATA cable, protective sleeve, screwdriver. It's worth noting that the OEM version does not include screws, and the screws that the intel drive uses are slightly off standard size and for some pc cases you may have problems screwing it in because the case screws are a little bit too little or too big.
I think the 180GB Retail is an excellent deal, coming to $1.36 per GB which is better than the unit price at any other capacity. Amazon sells the Reseller Kit (not Retail box) for $225, but won't ship to AU, and a freight forwarder would charge more than $20 to ship it to you.
PCDIY has stores in Box Hill (VIC), Auburn (NSW) and Adelaide (SA). If you don't have access to these stores, obviously I would never suggest paying $15 for shipping, but the 180GB still comes out cheaper than anywhere else (that I know of).
Direct link to price list: http://www.pcdiy.com.au/ad/Pricelist.pdf
Pcdiy delivers?