EDIT* please note comment by Max2010, retailer may not be permitted to send Levis to Australia. This seems to be verified after a google search.
JC Penny has nice pairs of Levis for $30USD, with the 20% off coupon JCPC20 the price comes down to $24USD/pair (less than $25AUD). After 18 October the code will expire, but you can use the code PCHAWNJC for 15% off.
I bought 6 items and my shipping costs came to about $8.50/pair, the shipping will cost more per pair if you buy fewer items. Not bad, last I checked Myer were selling these Jeans for $100.
got that kinda deal in harbortown in melbourne.20/pair only the clearance ones tho