If you're in Australia you won't be able to order it on Origin due to initial restrictions on the regions that are allowed to purchase the game, but you can order it from Game in the UK for about $65 including shipping. Anyone who pre-orders will get early game access.
After the initial 30 days of play is up, the subscription options start at US $15 per month:
Pre-orer Star Wars: The Old Republic [SWTOR.com]