Found this site, they seem to have some pretty awesome deals running on hard drives. (The best i see is the 500gV, which is priced at just over 10 cents per gB)
Anyways, here are the direct links to the offers in title, but check out the rest of the site as some other prices look reasonably good.
Note: One of the HDD's that are linked here do offer free postage, however i don't think the others do.
http://www.netplus.com.au/products-detail.asp?pcode=HDWE72RS…
http://www.netplus.com.au/products-detail.asp?pcode=HDWE72RS…
http://www.netplus.com.au/products-detail.asp?pcode=MYUSNP10…
http://www.arc.com.au/?HDSMSATA50016_CA << 500gB drive for $52!
It seems that all their items have pickup in stores (Sydney Locations), so look in the description of the link to see the availability
According to staticice MSY has a SAMSUNG 500GB SATA HARD DISK DRIVE for $53, however its only for NSW auburn..
This is still cheaper though :)