These were already the cheapest Australian or imported stock around.
TTR's : http://www.binglee.com.au/marley-em-dh001-io-trenchtown-rock…
imported ones on kogan or eBay go for around $280: http://www.kogan.com/au/shop/audio/?brand=house-of-marley
they also have the positive vibrations for $28 ($70-100 online)
http://www.binglee.com.au/marley-em-jh010-su-positive-vibrat…
and the smile for $18 ($30-70 online)
http://www.binglee.com.au/marley-em-je000-ra-smile-jamaica-i…
Instore only for the extra 30% off as featured in the catalog, to get the extra 30% off online you need to speak with the online reps.
I spoke to one of the online reps and they said they could not do that price unfortunately. $174 for what you get is still pretty good though :)