Byteback is a computer recycling program currently being trialled in Victoria (not sure about other states). If you have any old computer equipment (Monitors, drives, printers etc) then you can take them to various Byteback locations around Melbourne free-of-charge. I took my ancient computer parts, monitors, printers and accessories to the Boorondara Waste Transfer Station in Camberwell and it was quick, easy and free.
Approximate cost: $0