thinking of upgrading internet?

hi,
i live in QUEENSLAND GOLD COAST
i was wondering if anybody knew of a provider that is fast a lot of gigabytes and isn't expensive
i was looking for around

SPEED: 100kb/s - 150kb/s
GIGABYTES: 20gb - 30gb
COST: $0 - $60

something along those lines, because at the moment i am with TPG and i have 20gb 60kb/s and i pay $50

thanks folks