It depends on where you are transferring money to, or receiving money from, and the amount of the transfer. That said, here’s a real life example using an actual screen shot of how much you would save on sending AUD$10,000 over to a US beneficiary.
NAB would charge you a fee ranging from $10 to $30, and provide you with US$7,512.
ANZ would charge you a $18 fee, and provide you with US$7,500.
OFX would charge no fee, and provide you with US$7,827 – at least an extra $315!