Target appear to be having 50% off Telstra Prepaid 'stuff'.
This included a variety of low-end mobiles. Didn't have time to check them all, but took the attached pic which i thought was an ok deal (no idea if it includes data sorry).
From memory had the Lumia 520 for $44.50, and the standard Telstra USB 4G for $24.50
Note this was in the Glen, VIC
Ehh! Just paid $25 for used one at gumtree yesterday ;/ Still decent price compare to those dreamer at ebay asking for $70++. Also, this model can be easily unlocked(Code cost me $1.5 from ebay and you can unlock it for free with some research on google). The different between this one and vodafone one is the battery: This one have 3000++Mah battery while vodafone around 1500mAh++, also some 4g frequency is different. I would highly recommend this one for anyone who travel alot: Get it and unlock it and use local sim card (If you are using Optus post paid plan you can request data share sim card for one setup fee $5 and enjoy your data) :)