$129 at Optus. If you want to unlock it you can try contact Bagman https://www.ozbargain.com.au/user/56629
You have to search if it available at your nearby store because a lot of store already out of stock.
http://www.optus.com.au/shop/prepaid/mobile/huawei/ascend-g5…
| Huawei Ascend G510 | Specifications |
|---|---|
| Descriptive Colour | Black |
| Service Provider | Optus |
| Networking Connectivity Technology | Wireless |
| Wireless Protocol | Bluetooth |
| Technology Type | Touch |
| Packaged Quantity | 1 |
| Colour | Black |
| Brand | Optus |
| Internal Memory | 4 GB |
| Clock Speed | 1.2 GHz |
| Service Provider | Optus |
| Mobile Broadband Generation | 3G |
| Supported Flash Memory Cards | Micro SD |
| Primary Camera Image Quality | 5 Megapixel |
| Diagonal Size | 4.5" |
| Band | Dual Broadband |
| Phone Type | Android |
| Operating System | Android 4.1 |
| Number of Processor Cores | Dual-core |
Y210 http://www.officeworks.com.au/shop/officeworks/optus-huawei-…


vaya uses the optus network, so this should work for vaya right?