I recently signed up for an ADSL bundle and needed a very basic home phone. Lots in stock at HN Bondi Junction: http://imgur.com/sUcDwaa
Was $29 at HN mid year sale (https://www.ozbargain.com.au/node/147438)
There previously has been slightly cheaper version without the answering machine (https://www.ozbargain.com.au/node/136343)
The 8950 DECT Cordless Telephone with Answering Machine is a multifunctional and smart phone for your home or office. The phone has DECT Technology for improved wireless reception, easy-to-read display and plenty of memory for storage.
Wireless
The 8950 DECT Cordless Telephone with Answering Machine is fitted with DECT Technology giving digital clarity, range and security. The phone is also WiFi Network Friendly for easy access to the Internet.
Display
The 8950 DECT Cordless Telephone with Answering Machine has an orange backlit alpha-numeric display and a Flashing Message Indicator which shows when messages are left on MessageBank and Home Messages 101.
Memory
The 8950 DECT Cordless Telephone with Answering Machine stores 50 name and number Phonebook and 5 last number redials. The Calling Number Display has a 10 number Call List.
I got it for work last xmas $18 on special https://www.ozbargain.com.au/node/128418 and it's still working(some buttons have faded out and the range is not the best)