HP M1536 Multifunction Centre with Scanner, fax, monochrome laser, network, duplex $298
HP is a good choice as you can readily buy compatible toner cartridges.
Print two-sided documents automatically. Streamline your workflow by copying scanning faxing and connecting securely via Ethernet networking - ePrint Enabled Printer.
A4 Print,Copy,Scan & Fax from any computer on the network
Print Speed 26 IPM Black
First Page Out<8.5 sec
Auto 2 sided printing
2-Sided Copy ID
35 Sheet ADF (single sided auto document feeder scanning only)
250-sheet input tray
Print 600 x 600 dpi
1200 Scan DPI
Fax Speed 33.6 kbps
ePrint - Print from anywhere via email from any mobile device
Includes both PCL and Postscript printing.
Consumables: INHP2780BK (Black) HP 87A cartridge. Compatible cartridges (2100 sheets with 5% coverage) are around $18 on eBay.
USB Cable Included
You can get it for around $270 (or less) if you ask Officeworks to do a price match (varies depending where you live)