Pretty good deal as the G300+ supports Telstra's 850MHz as well as Optus' 900MHz and 2100MHz whereas the standard G300 only supports 850MHz and 2100MHz. So in theory, if you use an Optus SIM (assuming the phone is now unlocked) you'll get better coverage with the G300+ in comparison to the G300.
Deal is on page 23 of current Coles catalogue.
More info on previous post including unlocking details:
https://www.ozbargain.com.au/node/106872
Also a good deal for those (like me) that have Flybuys and can get a $20 Coles voucher for spending over $100, effectively brings the phone price down to $59.
Specifications
1GHz Qualcomm MSM7227A Cortex-A5 CPU, 512MB RAM, Adreno 200 GPU
4" 800x480 IPS LCD capacitive touchscreen, 16M colors with scratch resistent Gorilla glass
1500 mAH battery
FM radio, GPS, bluetooth, wifi. Can provide USB or wifi broadband tethering.
5MP rear camera with flash
OS: Gingerbread 2.3. An official ICS 4.0 update available here. Many user created ROMs at modaco.com including Jelly Bean (4.1/4.2) CM10 and MIUI based ones.
Memory: 512MB RAM, 4GB Flash with 2.5GB user space. Up to 32GB microSD external storage
3G UMTS: 850, 2100 MHz with 7.2Mbps data. G300+ model includes 900Mhz too - good for Optus.
GSM: 900, 1800, 1900 MHz
Have you recently received a targeted email offering this promotion? I can only find a similar one that ended Xmas eve:
https://www.ozbargain.com.au/node/127673