Huawei G300+ is back on sale for $99. It's a 4" IPS (800x480), single-core, ICS-upgradable smartphone with 1500maH battery. G300+ preferred over G300 as it supports 850, 900 and 2100Mhz 3G bands. G300 misses the 900Mhz band needed for best Optus coverage. Supposedly some OW stores have these so PM for another 5% off.
Previous comprehensive G300+ OZB post & discussion at whirlpool
Other current good-value options:
$129 Telstra Huawei Y300. 4.0" 800x480 LCD, dual core, 512MB, JB, 1700mAH battery, but locked to Telstra. Unlock codes may be available from bagman for ~$6. Unlocked versions available for $113 on ebay just ensure sourced through oz distributors to get local warranty support.
$139(price increased) $149 unlocked Optus Huawei G510 4.5" 854x480 IPS LCD, dual core, 512MB RAM, 1700mAH battery. It's biggest feature being a 900/2100Mhz band if need it for Optus use. Available from Optus in locked form too: $149 Optus Huawei G510$149 unlocked Medion (ALDI) dual-SIM, 4.0" 800x480, dual-core, 512MB, JB, 1500mAH battery, dual-sim, unlocked, 0.3MP front camera.
$198 unlocked Huawei Ascend G600 4.5" 960x540, dual-core, 768MB RAM, unlocked, 1930mAH battery.
$199 unlocked Huawei Ascend P1 4.3" 960x540 LCD, dual-core, JB, 1670mAH sealed battery, 1GB of RAM, 850/900/1900/2100 (quad-band). NOTE: no stock ATM but DSE have supposedly ordered 2000 units. So expect them in the next few weeks.
Good value, I think. Especially with the tri-band 3G.