OK, this may have been on here before, but though it was worth putting on, because I got $100 credit.
When a new customer calls up Three to buy a phone, just say you're a NRMA member, they will give you $100 credit on your first account! (I am an RAA member, but all aotomotive societies are just about the same, and why should NRMA members get it and not everyone else?)
I rang them and asked if they will accept RAA membership instead and they said no. Did they actually let you use the RAA membership when you joined?