You can easily vote early at: 

Randwick Town Hall from Saturday 07 September - Friday 13 September: 

Saturday 07 Sept: 9:00am - 6:00pm

Mon 09 - Wed 11: 8:30am - 5:30pm

Thu 12 Sept: 8:30am - 8:00pm

Fri 13 Sept: 8:30am - 6:00pm

For other sites for early voting - go to elections.nsw.gov.au