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Good price for Two Smoke Alarms, Single Smoke Alarm is $9.98 at Bunnings http://www.bunnings.com.au/quell-9v-ionisation-smoke-alarm_p…
http://www.safehouses.com.au/170/
I wouldn't entrust my families safety to an ionization alarm . If your going to have a smoke alarm make the first one a photoelectric smoke detector .
All new homes since 1997 have to have mains powered smoke detectors to be installed by a licensed electrician . IIRC flats can have battery backed devices so long as they are li-ion batteries .
These smoke detectors are really only good as an extra line of defence but better than nothing especially for a few sheckles .