Limited to the first 3,000. The answer to the question is 27. Enjoy!
EDIT: This offer appears to be available through sister stations as well, so the combined total MAY be 9,000 rather than 3,000.
http://www.2ue.com.au/comps-2uesustagengiveaway
http://www.6pr.com.au/comps-6prsustagengiveaway
FYI the samples are 60g in size.