I pay US$55 a month for unlimited data @ 50Mbit on my fibre/copper line, and US$100 per year for 80GB per year on my 4G mobile (there are other options up to about US$70/m for 150GB/m but no unshaped & unlimited data option.)

I suspect that part of the reason that 4G is so good in Australia is that data allowances are relatively small which limits congestion.