Spotted this in the Brisbane Courier Mail, claims it's 65% off the regular price of 35c ea. I do not know if it's a national promotion or not, best call your local HN before making the trip to make sure they are doing the deal.
Waiting times may vary between stores. Prints from digital media only.
Appears to be online as well: http://www.harveynormanphotos.com.au/category/prints-enlarge…
5x7" prints are $0.12, 6x4" prints are $0.09.