Free sample of Sustagen.
The answer is 27.
Limited to the first 2000 people. If this deal link expires you could also try the ones below. Not sure if it's 2000 per radio station or 2000 combined.
http://www.3aw.com.au/giveaway-sustagen
http://www.2ue.com.au/giveaway-sustagen
http://www.6pr.com.au/giveaway-sustagen
http://www.4bh.com.au/giveaway-sustagen
http://www.fiveaa.com.au/competition_get-your-free-sustagen-…
If you miss out, good chance most of your local pharmacies have plenty they don't want. Most just keep them behind the counter and let them go out of date because the staff don't want them. Nice proprietors will be more than happy to give a few out if you ask nicely.