if you can prove that the move is beneficial for you and or bub then it will be allowed. like you say it will be cheaper then that will make it better for both of you or if it was for a job so you could support her or even just to be near more family or friends(support network). it doesnt have to be much, it would be silly to make a person stay in one place just so the child can see the other parent when the home life would be worse off. my friend moved from sydney to rockhampton with her kids because she could not afford to buy a house here and up there was the only place she could ever own her own home. it was unfortunate they lost the 2days a fortnight with their dad but now they have financial security and mum is way less stressed and their life is much better. they see their dad in the holidays.