I was looking around to find a cheap twin bicycle trailer to take the kiddos out and found this. Seems to be online only and free shipping.
Can't find any info about it online or any reviews but for $60 it's worth checking out.
Will report back when it arrives
Also long running $10 off thanks to shap08 below
https://www.ozbargain.com.au/node/752117
You can pick up the bike the trailer and a baby seat attachment for the bike for pretty cheap considering it’s free delivery for one pass users