The FPP only has two option for RTC. A Rasclock and a DS1305. None of these seem to be available here in Australia. Bummer!

But SunFounder DS3231 RTC Real Time Clock Module seem to be all over Ebay for a couple of bucks.
DS3231rct1

DS3231rct2

Even DX.com sel;ls them http://aud.dx.com/product/ds3231-raspberry-pi-rtc-board-real-time-clock-module-for-arduino-black-961277258#.U3VmhCiBtuY
They are tiny. And these guys have got them going on the Pi
http://nicegear.co.nz/blog/using-an-i2c-real-time-clock-rtc-with-a-raspberry-pi/
So I will try also.